Without seeing you on your bike, it's hard to know what's going on.
I agree with Mimitabby, that it sounds like something is not right.
Is the saddle too plush, and it's squishing up into your tailbone? Are you sitting too far forward? (is the seat moved too far back on the rails for the position you ride in?)
The nose should not be on your girly bits. Nothing should be on your girly bits! And yes, you should be sitting on the back, wider part of the seat. Each of your sit bones will be happiest if they are centered in each "cheek" of the wide part of your seat.
I find that when I am happily riding along I really am not aware of the nose of my seat. I just use it to help me control the bike, I don't "sit" on it.
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson