Anal sex is a sexual activity that involves the anus. This doesn't necessarily mean anal intercourse. It can involve anus penetration but includes sexual activity that does not involve penetrating the anus. Anal sex can involve the use of tongue, fingers, sex toys (butt plug, strap on, among other things) or the penis. All individuals irrespective of their gender can indulge in anal sex. Your gender identity or your sexual orientation doesn't decide your interest or liking for anal sex. The anus has a very thin lining and both people with vulva and penis enjoy anal stimulation.