If a girl suddenly loses interest because they find out you don't have a certain something, then ask yourself how happy you'd really be if that is the only thing which keeps her attention. Better to find a thoroughbred than settle for a one trick pony, as it were. And when you
do find the lady who accepts you for who you are (which you will) you can take solace in the fact that she isn't all about the physical, that it's a deeper relationship, and one in which you can feel secure in yourself, and expressing yourself, rather than trying to live up to an ideal you think she has... as well as being able to explore the myriad other aspects of love beyond just jumping each other and going at it hammer and tongues.
Don't give up hope, chaps, because speaking personally, I've never met a more considerate, self-aware, genuine bunch of guys than you folks here. You don't pretend to be someone you're not just to impress, or pull the hard-man bravado nonsense, and you actually think with your brain. That would matter to me an incalculable amount more in a relationship than what's in your trousers. And in those thoughts, I'm pretty darn sure I'm not alone.