Knocker

A Girl Posts An Ad In Newspaper For Her Life-Partner:
"Need A Person Who Never Leaves Me, Never Beats Me & Can Satisfy Me On Bed."

Next Day A Guy With No Arms
& Legs Knocks At Her Door.
Girl: Who Are You? Guy: I Want To Be Your Husband. Girl: You Don't Fit For That.
Guy: I Don't Have Arms, So I Can't Beat You! I Don't Have Legs, So I Can't Leave You!
Girl: How Can You Satisfy Me
On Bed?
Guy: How Do You Think I Knocked The Door?