mosexual

A person, generally a man, who has openly and officially declared a desire for more sex. Often accompanied by a variety of loudly announced self-improvements, and viewed by partners (if any), as an increased cheat risk, though this isn't necessarily the case. Just damn motivated, that's all

Dude: Dave hurt his back.
Other dude: Huh? What'd dumbass do?
Dude: Lifting weights.. He's a mosexual
Other dude: Oh shit..
Dude: No no.. not gay. Just wants more sex. He's motivated