Immediately after riding, I get a numbness in the groin area. Usually, I don't notice as much, while on the bike. Nor do I really feel uncomfortable while on the bike. But if I've ridden 5 or more miles, and step off the bike, I'm pretty numb in the groin area. It can last for about ten minutes or more until I'm feeling normal again. Does anyone know what I can do to alleviate this problem? I think that I've got the seat situated at the proper height. Is it just something biological to do with me? Or are there specific seats that you think might be able to help me out with this? Should I try different seat positions? If so, what are they, the makers, etc. and where could I get them? This is one reason why I don't like riding much, like I used to, and I'd really like to start riding more often, commuting to work, etc. I've got a Trek, hybrid, nothing fancy. Any suggestions? Anybody here with similar problems? What can I do?