I don't like it either and personally I find it gross. But everyone has something that they like and this isn't something that is necessary and can be avoided. There are items that can make her not get pregnant, also Pregnant is by chance so if worse comes to worse just load your save to see the scene and if she gets knocked up then load back until she doesn't because of the scene.I don't play this game anymore because of pregnancy,I don't know what stupid fetish this is in games,I don't like that at all.
(sorry for bad english)