Because I was caught making my friend's Ken doll kiss my Barbie. I also stripped him to see his junk (as Gregor would call it!), but there was only a blunt bump. So untheocratic of me!
After that I was punished by having to endure a study of the Youth book or some such litter-ature. I was schooled on the fact that kissing would become stale for poor Barbie and she'd want more, thus becoming a hussy.
So I had only girls--Barbie and Growing Up Skipper (a porn doll if you ask me).
So.....I borrowed my neighbor's Planet of the Apes doll and Barbie dated him.