A remedy for morning wood. In the a.m. drain the female partner typically does not climax. Rather she is a willing and generous participant. Typically she would not have been able to climax that morning anyhow. Best case scenario - occurs while spooning so woman does not have to move from the position in which she was sleeping.
Outcome: Male is satisfied and extremely appreciative. Woman has gained massive amounts of goodwill with minimal effort.
"Honey, thanks for the a.m. drain. Can I take you out to dinner tonight as a thank you?"
"Yeah, I wasn't much in the mood this morning, but he was. Has an a.m. drain. Now I'm off the hook for a while..."