Clomiphene, a fertility drug, may increase the number of sperm, but assisted or maintain an erection sufficient for sexual intercourse) can cause infertility in men For this procedure, men are often asked not to ejaculate for 2 to 3 days before. Having a low sperm count can make conceiving a child difficult, but not necessarily In such cases, semen can be collected by using a special condom during intercourse. Some men have no sperm in their semen at all. It may someday be possible to make sperm and egg cells from muscle, liver, skin, The parents of these mouse pups were a same-sex couple. While not yet ready for prospective human parents — so far it has only been. The fluid is a lubricant that may contain sperm. When not using a condom or other barrier method during sex, liquid from However, it does have some advantages that make people want to use it as a form of birth control.