quitamine

A hormone excreted in the female body that causes a women to want to quit something. The gland is found in the woman's vagina. It is the opposite of adrenaline and is something a guy does not experience due lack of proper biological equipment (i.e. men have balls). It is often used as a reason why women want to quit something before it ends or gets difficult. It is also often used as a reason why women get bored with or fall asleep during sex. It is purely coincidental that it sounds like "quit on me".