Looks are nce, but for me the way someone acts, moves and holds her/himself does more than looks alone. I like Chelsea from the Tex Murphy adventures a lot. She looks nice and, well, radiates something that is very attractive to me. Another beautiful girl is Madeline Grip from Remedy. She doesn't move at all though
As for guys... I think Tex Murphy is an interesting guy, of course. Brian Westhouse... The gardener in the Carol Reed adventures...