biology

Viagra may make a man more loving as well as improve his physical performance, research suggests.

Viagra was found to boost levels of oxytocin.Scientists have discovered that the impotence drug can boost levels of a "cuddle chemical" in the brain.

Oxytocin, also known as the "love hormone", is thought to promote romantic feelings and bonding between couples.

The hormone is released during orgasm in both men and women and has been linked to sexual arousal. It also plays important roles in childbirth and breast-feeding.

Viagra, the brand name of the drug sildenafil, overcomes impotence by blocking an enzyme that limits blood flow to the penis.

The same protein, phosphodiesterase type 5, also acts as a brake to regulate oxytocin release in the brain. Viagra eases the brake off and allows cells in the brain's pituitary gland to generate more of the hormone [...]

-Telegraph

Or just get him to get his wisdom teeth pulled out and come home with a solid prescription for Oxy and you'll have a regular Care Bear on your hands.

But seriously. It is fascinating how much -- if not entirely -- we are ruled by biology(meaning: brains, hormones, drugs, etc.). My partner and I sometimes talk about this stuff:

Me: I'm obsessed with celebrities because as a woman I am predisposed to be naturally interested in things like relationships. It's just my biology.

Him: So is peeing. You don't pee on the street just because your biology is saying that you have to go now. Just because it's biology it doesn't mean you can't control it.

Me: We need to buy your father a present. His birthday is coming up.

Him: I am a boy. I don't remember dates.

Me: Biology. You should fight against it.

Him: Sorry, what were you saying?