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.
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.
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.