Half on a baby seems like a recipe for drama down the line. I am someone who will discuss children AFTER marriage. No marriage, no baby! As for getting with someone who switch hit...Seems cool for thrills, but when it comes to starting a family, I don't believe in sharing partners(willingly or not). Either me and the woman jump the broom or stay childless(me). However, in my situation, many women already have kids, so I don't think about being in such a situation.

If it works for you or anyone else, then go for yours . To each one's own..