Self Tap
Having sex with your twin.
I was so horny in Antartica that I had to self tap my sister.
Self-Tapping Screw
When a Woman is giving you a Blowjob and demands you allow her to bend your cock, then stuff it into your ass, just as you are ejaculating, causing a pearl necklace to drip down your inner thighs.
My Girlfriend insisted that she be allowed to perform a “self-tapping screw” on me.