You can probably get a fair estimation of what it feels like by putting on a strapon and then masturbating. Except for the difference of having that weight extended from the male body, the physical sensations are supposedly very similar between the genders, as near as the medical experts can determine by measuring physical response. But I'm sure that's not a satisfying answer. It feels like a very pleasant buildup of pressure, followed by a loss of control of the thrusting muscles and the pumping muscles in the groin that is even more pleasant, almost to the point of deliriously so. Then an overall feeling of well-being that lasts for up to 20 minutes. My balls feel empty and cold afterward.
A high state of arousal is primal, powerful and exilleriating. A strong erection can give me a feeling of strength and confidence. Knowing my women wants it is an emotional rush unto itself. My desire is like a hunger, demanding to be fed. A woman's vagina grips me perfectly while conforming to my shape.
Orgasm begins in my pelvic area and spreads. My cock becomes very sensitive and the slightest touch feels divine.
For me, my orgasm begins with what I would imagine is a similar sensation to what women describe as a tingling in their pussy. But for me, this is only just before orgasm. My cock getting hard doesn't really in and of itself "feel" different other than in the obvious ways.
As that tingling starts, what conscious thoughts I do have are dominated by things like, "Oh yes! Oh yes!" Sometimes I know that the longer I can hold off, the more intense the orgasm will be. Eventually, I will tense up. If I am inside my woman, I'll usually thrust as deep as I can. The first ejaculatory pulse is always the most intense, and if I'm not contained, it will shoot quite a ways. After the second or third pulse, the crash will start, and I'll collapse into afterglow. I will usually pulse a few more times, trailing off. My cock is actually more sensitive after I've come, but not in a particularly comfortable way.
If I've been taking care of myself, I'll reach for the tissues and clean up. I like to do this even if I am heading for a shower, as I don't want to drip anywhere.