Ding! Ding!

A woman's husband has died. After a few months, she decides she wants a new one. She submits a classified ad as follows:"Widow looking for a new husband. To be considered, you must conform to these three criteria:1 - You can't beat me (as my first husband did).2 - You can't run around on me (as my first husband did).3 - You MUST be good in bed (as my first husband wasn't)." A few days later, the doorbell rings. She opens the door and a man without any arms and or legs is sitting in a wheel chair." Can I help you?" she says." I'm here about your ad in the paper." "Which ad is that?" "The one looking for a husband." She says, "Uhm, well, there were certain criteria...
""Yes, I know. Obviously, I could never beat you...
I have no arms." "Well, yes, I see that...
but there were other criteria." "And, as you can see, I could never run around on you...
I have no legs." "Well, yes, that's true...
but there was one other thing that is very important...
""Ah, yes, well...
how do you think I rang the door bell?"