Some men would not still be HIV negative or alive, if they had managed to sleep with some of the women with whom they want or wanted to have sex.
A seemingly simple task like taking a bath or wearing a condom feels like multitasking to someone who suffers from hemiplegia or has only one hand.
The human population would probably be way less than a thousand, if ejaculation were not usually accompanied by an orgasm.
Some women would not have contracted an STD or STDs had they not been on the pill.