Do ladies like it when a guy grabs their butt?

Answer 1

Amost never. It is highly inappropriate and, in the United States, it is considered "sexual harrassment" if a man touches any part of a woman without her permission. Sexual harrassment is against the law, and a woman may bring charges against an offender.

It may be an indication of possessiveness or showing off, and is usually considered rather crude and inappropriate even with a romantic partner; although in some cultures it is a sign of affection and appreciation of a woman's "assets."