If you do a search, this topic has been talked about many times. To put it mildly... Most likely, you need to adjust your saddle and possibly other bike components. You are sitting on parts that ought not be sat on while riding. You should not be leaning forward on that area. You should be sitting on your ischial tuberosities. (sit bones) Here are a few threads that have dealt with this issue. The best advice is usually... get a professional fit done and if needed, change saddles. Good luck.

http://forums.teamestrogen.com/showthread.php?t=20938
http://forums.teamestrogen.com/showthread.php?t=20493
http://forums.teamestrogen.com/showthread.php?t=16527
http://forums.teamestrogen.com/showthread.php?t=14487