A person who always wants to take and not give anything while in the act of having sex. This may be someone who forces his partner for a blowjob
, or positions which requires no participation from this person (Like woman-on-top
) and won't do the honor to satisfy his / her partner.
This comes from the popular word couch potato
, basically describing someone who is lazy, sitting on the couch and watching TV (yes, without bothering to entertain the TV set once he's done)