A lice-killing lotion containing 1% permethrin or a mousse containing pyrethrins and piperonyl butoxide can be used to treat pubic (crab) lice. These products are available over-the-counter without a prescription at a local drug store or pharmacy. These medications are safe and effective when used exactly according to the instructions in the package or on the label. Lindane shampoo is a prescription medication that can kill lice and lice eggs.
Trichomoniasis is another type of vaginal infection. It is caused by a single-celled parasite that is usually spread through sex. In addition to causing bleeding after sex, it can also cause vaginal discharge and itching.
Pelvic Inflammatory Disease. Women with pelvic inflammatory disease, or PID, can also experience cramping after sex. PID can be caused by chlamydia, a very common STD, and in some cases, gonorrhea. When PID occurs, the fallopian tubes and uterus become inflamed, which can cause pain after sex and during other times.