The best way I can explain what happens with me, is in two parts:
Part 1.
For me, when I meditate, the object, as mentioned in an above post by gazeebo, is to disassociate from distracters in the physical world. What that means to me, is psychologically withdrawing from distracters as follows: sound,sight,touch, and smell to the point that I am aware of them yet not distracted from my point of focus by them. The point of focus for me in day to day living is primarily putting my attention on the quiet, calm point that is within all of us. That particular point of calm is perceived by me as bright, stable energy…some call it the third eye or the sixth chakra.
The object for me when I meditate is to bring myself down to a state of calm from wherever I was at prior to that without falling asleep. Remaining awake yet not asleep dreaming, letting thoughts drift without active direction is encouraged as a method of letting them go briefly so as to gain a different, fresher perspective when you think about them again. Doing that quite often renews my energy, both emotional and psychological. The net result of this is that my blood pressure goes down, my stress level goes down, my thinking becomes more clear, I am overall more at ease in general behavior and demeanor and less worried about things that my intellect ‘knows’ nothing can be done about, so why worry?.
Part 2.
Once I have become comfortable doing that at length, and it has become a natural/comfortable thing for me to do(it will not happen over night, it takes time to learn just like anything else.), then I can start focusing on one thing or another while meditating. Some examples are: a noticeable increase in the focus and clarity of my hearing, an in crease in my sense of touch, an increase in my ability to perceive tiny variances in temperature and their direction and what the source is, a distinct improvement in my olfactory(smell) perception and differentiation, and an enhancement in how I perceive what I see.
Once I am able to maintain a meditative state no matter what, then I can focus and concentrate on individual things completely with out distraction, increasing or decreasing their impact on me.. Some examples would be a particular aroma, a particular sound, a particular physical feeling, a particular visual sight. In the case of physical sexual arousal/stimulation/sensations including enemas, I am able to do this more easily solo than I am with another individual. This is because when alone, the only pace and emotional and physical state you need be concerned about is your own. When with another individual, it requires that both parties be in/at the same meditative state, otherwise it will not work well if at all.
I have done so with another person rarely, yet would like to find just such an individual. In my circumstances, it revolves around focusing on, monitoring, and controlling the state/rate of sexual arousal when the normal impulse is to go for the all out peak and over right away. Instead, I slow the rate of climb to the sensational peak, and then once coming near it, searching for a plateau (pleasurable flat spot) to stay on for as long as desired or am capable of, so that I may savor it before letting go and releasing in a cascading slide down the other side. The release for me has quite often lasted much longer in a meditative state than when I am not.
G.N.