Let's say you walk through an informal college lobby-type setting and see two couples. Couple A is sitting on a couch and kissing, while Couple B's male half is giving his female counterpart, who is lying on the carpet, a back rub. Both couples are in the least obvious areas they could find, but as this is a lobby, they are visible to most who walk by.

Which couple do you feel is behaving in a less appropriate manner? Why?