Your size also determines whether or not a girl will be willing to lift you. I'm a pretty small guy, so when I jokingly ask another girl for a piggy back ride, they usually oblige. As long as you play it off as a joke, the creepiness factor goes away and the girl will usually feel more comfortable. Also, don't expect a girl to give you anything else except a piggy back ride or a cradle. Cradles can be pulled off quite easily actually: all you have to do is start taking a few pictures with them, and then jokingly ask if you can take a picture with you in her arms. The more comfortable YOU make them feel about the situation, the more likely they are to lift you. That comfort can be obtained by playing everything off with good humor. It takes a little practice, but it's not too hard.
