Uh, because it engenders a whole bunch of deep emotions / massive and unique neurochemical responses in people, particularly it plays a massive role in regulating oxytocin, and plays a considerable role in creating stable pair bonding between two people.
… Wow, you’re serious.
Uh, because it engenders a whole bunch of deep emotions / massive and unique neurochemical responses in people, particularly it plays a massive role in regulating oxytocin, and plays a considerable role in creating stable pair bonding between two people.
https://mindlabneuroscience.com/brain-chemicals-during-sex/
I’m genuienly baffled that you need this explained to you.
Apologies for using shorthand to refer to a whole bunch of complex neurochemistry, I’ll be sure to spell out the details next time.