text: how important is sex in a relationship and how important is penis size in that sexual part of that relationshi   sex is important.  how important varies.  penis size has little to do with a healthy sex life.  if a woman's vagina is large, it is not becasue she has a lot of sex.  some women have larger vaginas than others, just as some men have larger penises than others.  most women acheive orgasm through clitoral stimulation, and the penis has very little to do with that.