For most guys, a kick-ass sense of humor in a woman ranks right up there with a nice rack. But some material is no laughing matter. So while its cool to clown around, stay away from these supersensitive topics.

1. His Future Hair Loss. With the exception of Vin Diesel and a few others, most guys with shiny chrome domes are not deemed the sexiest men alive. Thats why many guys stress about potential future loss. And if theres even a hint of thinning, its certain to be a really sore subject.

2. His Paltry Paycheck. Yes, its a little Stone Age, but many men still like to think they can bring home the bacon. When their salaries dont stack up, they may feel emasculated. So while you may find it funny to joke about your sugar-mama status, its not exactly the idea of good stand-up comedy to your guy.

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3. His Mom.  Hes allowed to goof on his mothers muumuus, burned Bundt cake, and obsession with Dancing with The Starsbut when you chime in, its a different story. Guys find it disrespectful for girlfriends to rip on their moms.

4. His Member.  If you ever want his penis to come out and play again, keep any and all down-there jokes to yourself. Guys say theyre sensitive to any comments about the size, color, or shape. So stay mute about his mini-meunless you want to characterize it as monstrous.