At a cocktail party, an Obstetrician's wife noticed another guest, an over-sexed woman, making overtures towards her extremely, drunk husband.  But it was a large, informal gathering, so she tried to laugh it off.

Then she noticed them disappear into a bedroom together.

At once she rushed into the room, pulled her incoherent husband away from the skank and yelled, "Look, lady..!!  My husband just DELIVERS babies, he doesn't INSTALL them..!!"