no, coitus interruptus is onder than that.
Onanism is from that scene, and means masturbation, even though Onan wasn't masturbating, he was pulling out because he didn't want to impregnate his dead brother's wife. It's not a sin to masturbate, it's a sin to not impregnate your dead brother's wife. It's also okay to masturbate as long as you eat the sperm. sexinchrist.com
said so. Don't bother them about it. And yes, that is a real site.
Also, why was God watching this? Because he's a pervert.