Because it gets kinda confusing.
In terms of starting up, some terms are better than many other. Both you and your buddies all probably agree totally that kissing with tongue is named a French kiss, and that “2nd base” means boobs may take place www.chaturbatewebcams.com/college-girls somehow. But once it comes down to intercourse, there appears to be more confusion. Like, what goes on for two seconds if you only did it? Or imagine if you’d intercourse with a lady?