I took some notes here and I'll chime in with a few answers. My feelings a pretty similar to those previously expressed with a few exceptions.
I don't really have an issue with testicular crowding. The hips are set far enough appart so there is a bit of a gap between the upper thighs for everything to fit and things are mostly out front anyway.
I am 33 and I have as many erections now as I have ever had. I probably have a slightly above average drive and it hasn't changed much over the years. They can happen at any time for any reason. The worst are caused by stimulation from running/jogging or just walking long distances. This is irritating because the same stimuli can then cause chaffing... I don't usually feel the need to "take care of it" unless it is persistant enough to become a distraction.
I wear jeans a lot so erections can be uncomfortable because the material does not flex much so as the erectile tissue engorges with blood and the shaft lengthens I have to adjust to the left or right so there is room for expansion.
I am personally circumcised and am happy for it. The cleanliness is worth it. Also, females seem to prefer it.
After orgasm I become flaccid within minutes and lose sexual motivation almost immediately. This lasts for just a few minutes as the hormones are flushed and refreshed by the body. I do, however, pretend this doesn't happen for the benefit of my partner. The refresh is pretty quick for me so it's not a big deal and I can be ready to go again in about 5 to 10 minutes. During that time I just switch my attention exclusively to my partner. And as I stated above, age hasn't affected this much.
I don't really feel the need to cum on my partner. I MUCH prefer to cum inside her. Mouth, vagina, or anus. Doesn't really matter. It physically feels better to me and the mess is contained and easier to clean up. Also, I do like a girl to swallow but I think this is tied to the act of spitting out food being rude.
I think that is just me being odd.
I do like the feeling of being deepthroated but the same feeling can be replicated by a strategically place hand. It just makes you feel like your whole member is encased in a warm, wet place. It's just a physical thing to me.
Lastly, I am a hetero male and I THOROUGHLY enjoy prostate massage performed by a girl. That in conjunction with oral results my most powerful orgasms. The first time it happened I was afraid I would blow the girls head off with the force of the ejaculation. lol It was a feeling like none other.