What are the explanations for the different kinds of sex?

There are at least 3 types of sex which include oral, anal, and vaginal.

Oral sex isn't sex in the commonly understood sense. Partners take each others nipples, penis, vaginal area, or anal area into their mouth for stimulation. It's also licking sensitive spots on the body. Diseases can be transmitted this way.

Anal sex is where a man's penis enters another person's anus (poop hole), or when a woman uses strap-on dildo (fake penis) with another person. Either partner may be male or female. Couples of any sexual orientation can do this. Diseases can be transmitted this way, particularly if the active partner is male and unprotected.

Vaginal sex is where a man's penis or a woman's dildo enters a woman's vagina. Diseases can be transmitted this way.