NSFW.

According to an editorial in Nature,

The stimulation of the cervix and nipples during sexual intimacy are potent releasers of brain oxytocin, and may function to strengthen the emotional tie between partners.

How many men are busily revising their sexual repertoire right now, either to increase, or reduce, the amount of cervix and nipple stimulation depending on their preferred commitment profile?

This is where the social scientist in me wants to do a study. No, get your mind out of the gutter. Not like that. That would be unethical. I suppose. The IRB would certainly disapprove.

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