Technically, you felt the sensation of what you believe sex would feel like -- if you've never had it? We all have a different sense of our bodies and an imagination; we've had experiences in our past and we sort of try to match up our past experiences with the experiences we are having right "now", our past's future. That's how we make visual mistakes; our eyes have been "trained" to see things a certain way and this "looks" like it if our thinking and analysis don't get in there and teach our eyes their mistake (like those pictures that you can see "two" ways).

You have taken X feeling inside you and decided that must be what having sex feels like. For me, dreams use unconscious thoughts/feelings and personal symbolism and fantasy in my creation of me to give me a "message" of some sort, to get some information to me in my conscious life or to help resolve some issue (stress or physiological relief comes to mind with sexual dreams) my whole "Self" is having.

That you have very sensory dreams is probably good, allows you to use more of yourself to help balance yourself than a lot of people are able to. Not everyone dreams in color, for example, but one can see how much color might "help" (yellow symbolizing "fear" or green, "growing", etc.) one and, if we stay asleep when we have certain dream experiences (having to go to the bathroom, being "thirsty") then I imagine that has a different "purpose" for me than when I wake, to, say, a ringing phone that does not exist in my waking world. The body has a lot of physiological functions going on when we are sleeping and, if my blood pressure or O2 saturation level, breathing, etc. goes haywire, I want my unconscious mind to be able to wake me (alarm bell :-) so I have a better chance of survival?

Most males and some females have had sexual ejaculations during sleep before; it's a physiological thing, fine to say one will go without sex, are going to abstain or be celibate but it is not a wholly "mental"/will thing that we get to "decide" on. Our bodies are "whole" and can't be divided up neatly into mental/emotional/physical/spiritual, etc. other than in our "mental" way. Sometimes when I'm feeling down, I imagine my Body laughing at me, trying to think "I" am in charge.