Statistics v. Natural Selection

There’s a post over at statistica about the percentage of U.S. adults who identify as LGBT. It shows that the incidence of LGBT identification has increased from generation to generation.

The sexual practices of at least the LG portion are sterile—that is, they can’t result in a child being conceived. So if LG people are born that way, it is likely the result of one or more recessive genes which will not be passed along as a result of same sex relationships. So where is this increased LGBT identification coming from?