Why are heterosexual women jealous of gay men?
because gay men can perform fellatio on men better than they can.
Why are heterosexual women jealous of gay men?
because gay men can perform fellatio on men better than they can.
The joke plays on stereotypes about gay men's presumed skill in performing oral sex on men, and heterosexual women's potential jealousy of this. It implies a competition or comparison between gay men and straight women, using a rather explicit topic for humor.