Love Hurts, but making a Baby is killer?

kkay I'm confused, and probably gonna get a bit offending, but I have a question. how is trying to have a baby a battle? do they have to put their armour and helmuts on before they have sex? is it more of a wrestling match? just don't tell me they tag team. No wonder they're not having babies. It's kinda hard to get aroused when someone's trying to toss you across the room as you try to dislocate their shoulder in the process.....