think cave-people instinct. man gets excited, needs to fuck a woman to impregnate her to further humanity. woman needs to not fight too much because it's completely unenlightened times and they barely can tell that it is supposed to go in the front hole and not the back simply because the front one is wet enough to get the penis in. plus, the melting and fluttering is probably just an inherent conditioned response passed down through all human time via our genes that tells a woman she's in love so she can mate. because if the heart didn't flutter and stuff, how else would you know? animals do this by simple instinct, we do it by a very complex SET of instincts.
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