That geeky girl in the floral prints and glasses from “Blossom” is dishing out sex advice? Damn, I must be old. Yes, Mayim Bialik has plenty to say about sex and she is dishing it out on Kveller.com, a Jewish parenting web site. With baby-making on the brain, Mayim quotes the Torah on waiting seven days, plus an additional five, for a woman’s most fertile time. It’s all part of being a good Jew, you see. “Judaism loves love. We love sex. We are told it is a mitzvah to make love and to especially make love on Shabbat, when God’s presence is close,” Mayim explains. “A woman’s right to sexual satisfaction is detailed in her ketubah, her marriage contract, independent of pregnancy.” 
 
 She continues: 
 
 “Sex really can be for fun and for free; thank you Judaism. And when you are not cycling, such as during pregnancy and after menopause, have as much sex as you want. Have it upside down and sideways and from the chandeliers. It’s all good, it’s all kosher, and it’s a wonderful reminder that Judaism is pleasantly focused on how we live, rather than what happens after we die.” 
 
 What a lovely sentiment — it almost makes me want to convert. Thanks, Blossom! [Kveller] 
 
 Mayim isn’t the only celeb who knows a thing or two about a thing or two. Plenty of other celebs fancy themselves a Sue Johanson — although methinks John Mayer’s ability to dole out sex advice is dubious at best. Take a look at some sex advice from celebsand judge for yourself. ||||| Julie Klausner has slept with a lot of losers and perverts, she tells us in her funny, trenchant new collection of essays I Don't Care About Your Band. She is not permanently wounded by these encounters and yet she feels bad. And then she feels bad about feeling bad. "When you cry about things not working out, you're crying not only because a guy you slept with now doesn't seem to care you're alive," Klausner writes, "but also because you're ashamed of yourself for crying." 
 
 Why would she be ashamed? After all, Klausner is a feminist who doesn't believe there is anything wrong with casual sex. But she's not the only recent memoirist with regrets. Hephzibah Anderson had such deep ones that she decided to abstain from what she calls "penetrative sex" for a whole 12 months. "A tiny bit of me can't help judging myself, nor, presumably, can those women who consistently shave their own tallies in sex surveys," she writes in her memoir Chastened (out in the United States in June), which chronicles this self-imposed dry spell. "Liberated women that we are, we'll blame Victorian morality and its outmoded, repressive mores—we'll blame ourselves for succumbing and we'll deny our feelings." 
 
 From whence this confusing, shame-feedback loop? Compelling research shows that hooking up is not psychologically damaging, and only purity-ring-clutching evangelicals believe that it's wrong to have sex before marriage. Feminist Web sites advise that is it our "feminist duty to 1) seek pleasure and feel entitled to it and 2) to make the world a more orgasmic place for other women." And yet there seems to be something else at play in the culture that's making Klausner and Anderson regretful, some new wave of anti-orgasmic sexual conservatism that makes you hate yourself for what you did last night. 
 
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 Sex regret seems to come in cycles, and we're definitely experiencing one right now. In the '60s, Cosmopolitan's Helen Gurley Brown told us in Sex and the Single Girl that "sex is great, and that one should get as much of it as possible," as The New Yorker put it. In the '70s, the sexual revolution reached its peak with Erica Jong's "zipless f---." But by the end of the '70s, Gail Collins argues in When Everything Changed: The Amazing Journey of American Women from 1960 to the Present, women were obsessed with the casual-sex cautionary tale Looking for Mr. Goodbar, "which painted a picture of the new morality that was so dismal it's a wonder the entire generation didn't head for the convent." Then came "spinster panic," involving narratives that focused around the "beautiful, lonely career woman." As Collins notes: 
 
 "The Revolution Is Over" announced Time in 1984. In fact, what was over was not the dramatic change in women's feelings about the double standard that had been at the heart of the sexual revolution. What ended was the to-the-nth-degreeness of it—the group sex, the casual encounters at a rock concert or airport ticket line that led almost instantly to sex behind a tree or in a plane restroom. "The difference now is that things are not so casual. The women I speak with seem to want to know their partners," said the director of the health center at Wheaton College. 
 
 The current raft of regret seems to be a response to the Girls Gone Wild archetype of the late '90s and early aughts. Ariel Levy described the new era's version of sex positive in Female Chauvinist Pigs, "a tawdry, tarty, cartoonlike version of female sexuality has become so ubiquitous, it no longer seems particular." We were supposed to dance on tables like Paris Hilton and wear ass-baring chaps and hump the floor like 22-year-old Christina Aguilera did in her "Dirrrty" video, or at least find that sort of thing appealing, otherwise we were marmish prudes. We were supposed to go to strip clubs and wear Playboy necklaces around our necks—as Sex and the City star Carrie Bradshaw did. 
 
 But after a while, we did not really want to do any of those things anymore, as Tina Fey explained in an interview with Vogue earlier this year. We have been handed "a sort of Spice Girls' version of feminism. We're supposed to be wearing half-shirts and jumping around. And, you know, maybe that's not panning out." Girls Gone Wild founder Joe Francis was put in jail. Christina Aguilera married a nice Jewish boy and had a baby. She's been replaced on the pop charts by 19-year-old virginal chanteuse Taylor Swift, who sings chaste love songs about Romeo and Juliet. Paris Hilton is rarely in the tabloids and we haven't seen her nether regions in years. Finally, the fictional Carrie Bradshaw is wed and living a New York domestic fantasy. 
 
 And there's the flip side to the stripper fantasy. Domestic bliss is now the cultural ideal for young women, which is why Lori Gottlieb haranguing women to settle for Mr. Good Enough in her new book Marry Him hit such a raw nerve. Cue the "spinster panic" articles, like this one from the New York Times in January, which talks about how successful beautiful women are "victims of a role reversal" that will leave them single because men aren't making as much money as they are anymore. 
 
 At the start of this decade, we have thoroughly internalized these recent conservative cultural messages about the importance of marriage: "73 percent of women born between 1977 and 1989 place a high priority on marriage," writes Hannah Seligson in the Wall Street Journal. If what Gen Y wants is marriage, then it follows that feelings about sex would be more complicated—and in some cases, deeply judgmental. A Princeton freshman wrote an op-ed last week about why her friend should not be allowed to claim rape after a night of highly inebriated sex, the implicit message being that she should not have been having inebriated sex in the first place. A poll taken last month in London showed that women were less likely to forgive a rape victim than men were. 
 
 Of course, the Princeton freshman was roundly pilloried, along with Lori Gottlieb. Women are not quite ready to admit that we are ready to be domesticated again. But the Girls Gone Wild model doesn't appeal much either. Caught between the false liberation of the last decade and the fervent conservatism of the new one, it makes some sense that Hephzibah Anderson called the whole thing off for a year. It's much easier than dealing with the shame cycle. 
 
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– Mayim Bialik, perhaps better known as TV's Blossom, recently talked sex on Jewish website Kveller. "Judaism loves love. We love sex. We are told it is a mitzvah to make love and to especially make love on Shabbat, when God’s presence is close," she writes. "It’s all good, it’s all kosher, and it’s a wonderful reminder that Judaism is pleasantly focused on how we live, rather than what happens after we die." Not all celebrities are so religion-focused when talking about getting down and dirty. The Frisky rounds up 11 more pieces of advice: John Mayer: Reportedly told a woman at a bar that she should always remember to talk dirty in bed. Jane Krakowski: But while you're talking dirty, remember to call your partner a whore as opposed to a prostitute, she advises. Spencer Pratt: While we're wary of taking any advice from either half of Speidi, we'll relay it nonetheless: Spence thinks you should go on a sexual shopping spree and buy as much as you can afford from your local adult store. Jada Pinkett Smith: To keep the passion alive in a long-term relationship, do it in sneaky places like on the side of the road. Cameron Diaz: No matter what you do, don't fake it in bed. Click for the complete list, and to find out which star thinks "foreplay" should be called "teaseplay."