It's early in the morning or very late at night and your partner is tired. However, you needs to git yours - so what do you do? You get their consent to use the "ass groove" as a makeshift humping device and proceed to indulge yourself like a dog doing wrong. The real question here is will the end result stay in your boxer shorts or is your partner a true champion, willing to get their back wet.
Dude, I was so horny last night that I convinced my old lady to give me a Lazy Lover.