Usually if it's a girl, you should be very nice to them and ask preliminary questions (because with clothes on, you might decide she's not worth it underneath them) like, "how much do you weigh?" and "would you be into wearing stilettos?" and "Can you fit into a corset?" Then compliment them even if you don't mean it. Her responses will be telling. For instance, when you say, "I bet you have nice looking breasts and nipples." If she agrees, that's a good sign. If she's shy about it or just laughs, she likely does not have good looking breasts so you'll need to consider if there's other parts of her body that make up for it. At this point, ask - and to loosen her up a bit, don't use the correct words like "vagina" - say, "slit" or pussy or "snatch." Say, "I wonder what your snatch looks like. Is it the kind where the meat hangs out? Or is it nice and flat?" and "Does it look hot?" Finally, ask her to remove her shoes and socks. If her nails are not painted, she's a lazy pig and you should leave immediately. If they're painted, that's a good thing.
Finally, for her behind (and don't say "behind." Say "tush." Ask, "Does your tush look good?" If she's enthusiastic, try to get confirmation by saying, "Yea but lots of girls' tush looks good when they're wearing pants but when they take them off, you can see cellulite. You don't have any of that, do you?"
There you go.