Quite a few bike messengers tilt their saddle forward a little bit. Personally, I do it because if you're riding a long distance, it will put more weight on your arms, tilt you forward, make you more aerodynamic, it's better for speed, and it takes the weight off of your "sensitive areas". There are some pretty interesting studies about riders with perineum numbness. Tilting the saddle forward will help relieve the stress on the mentioned area, and put more of it on the sitting area. BE CAUTIOUS: this will put considerably more stress on the arms and shoulders. Be prepared. As with anything else, your body will adapt naturally after a while.