What's the best part about fucking a pregnant chick? Getting your dick that close to a child without going to jail.
I'm not sure why you would make this kind of joke?
Fucking a woman who is pregnant is awesome. I mean come on it's two for the price of one.
While having sex with pregnant women may be fun, I don't understand why you continue to make this joke that a lot of people would consider pedophiliac in nature. Making fun of having sex with a child will make nearly everyone uncomfortable and you may be hassled by the police if you tell too many of these jokes to too many people and one of them takes you seriously.