The Rational Male is a good book. I wish that I would have read it about 5 years ago.
As for the wall...Who knows. I'm way past 30 myself. Oh well.
Penis size.... I would say I am a little above average, but then I don't go around comparing myself with other Dudes "johnson". LOL I have never had any complaints.
From my experience there are a lot of factors when it comes to pleasing a woman sexually. Being physically fit and stamina are important. Also as mentioned above, knowing how to turn a woman on is just as important and may be the most important thing. Knowing how to go down on a woman is very important and I have found that many women enjoy that as much or more than regular intercourse. Being able to bring a woman to orgasm with your tongue can really please a woman. And try to make sure you can control yourself and let her orgasm first Before you do can make you an Allstar in her eyes.