I've read a women will become more attracted to a man if she receives his seed inside her. Sperm comprises only about 3 percent of seed. The rest is seed fluid: mostly water, plus about 50 compounds: sugar (to nourish sperm), immunosuppressants (to keep women's immune systems from destroying sperm), and oddly, two female
sex hormones, and many mood-elevating compounds: endorphins, estrone, prolactin,
oxytocin, thyrotropin-releasing hormone, and serotonin.
Don't take my word, look up "Attention, Ladies: Semen Is an Antidepressant" on any search engine
It's not that far fetched when you think about how most animal species pair up. Once a female chooses or is choosen by her mate, is mounted and inseminated, more often than not she will spurn most other males around her.
So cucks, if you want your hotwife to feel happy and attracted to their bulls it's imperative the bull deposit as much seed as possible deep inside her, while your own seed should be reserved only for her tits, ass or chin. It'll keep her wanting and going back for her bull again and again.