Booga likes tits. Tits and hot little bodies. If the woman can kick his ass and possibly annihilate everyone in the room... he's hooked. Good luck trying to get rid of him, because he's probably super attached. He likes a girl who can indulge in things, and also knows how to keep him and his stupidity in check. He loves Tank Girl with every part of himself because she's everything he wants. She's crass, rude, she's real, she's philosophical, she's smarter than he is, she's dangerous, while having his soft side that she guards with her life. She takes risks, but she always seems to know what she's doing, and is the embodiment of controlled chaos.

After having Tank Girl, why would he even want anything else?

That's not to say he doesn't enjoy taking a gander at a sweet young thing every once in a while.