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Is it okay to feel lightheaded and dizzy after physical activity?

1) When I do a 3-mile or 5-mile run, I run for time and try to finish with nothing in the tank. The closer I get to the end, the more I push myself, because I know I don't need to sustain the effort much longer. When I stop running, I suddenly get very light-headed and dizzy. It never happens while I'm running. I walk briskly while I'm warming down, but that doesn't prevent it. Why does this happen? Is it dangerous?

2)  Sometimes after jogging a while, or cycling a great distance, my head begins to spin and I feel as if I'm going to pass out. Is it normal to have feelings like these, and if so, how intense should these feelings be?


Can frequent masturbation affect sexual function?

1) Hi! I have a question about orgasms. I'm a female who has masturbated since her early teens and wonder if I've "overdone" it somewhat. I did it so frequently (sometimes every other day or so; sometimes I waited longer) that now that I'm in my early 20s, I find it harder to reach orgasm, and harder to have multiple orgasms (it used to come so easily to me). Have I "lost" that momentum? Can I regain it if, say, I stopped masturbating for several weeks or months?

Also, my partner stimulates me manually or with his tongue, and I haven't been able to "come" yet... is it because I've masturbated too much? Do women take longer to come? I think he gets bored doing it...

2) My boyfriend has trouble ejaculating, usually taking a long time. I was wondering if it could have to do with his constant masturbation during most of his young life. Could it be that the problem is me? Is there a possibility that we can improve the situation?


Why have I started fantasizing about women when I've only ever liked men?

I have always been attracted to men, and have only been with men. I am currently happily engaged to a man, and have no doubts about our relationship. However, I've discovered over the past couple of years (even when I was with my previous boyfriend) that I do not like porn with men in it. I like lesbian porn! And anytime I've masturbated I've fantasized about women (never one that I know or have seen.) It's made me very uncomfortable, finally admitting it to myself. I do remember when I was in 7th grade there was a new girl at our school. When she got a boyfriend I was very jealous; I just assumed it was because she was new and I didn't have all her attention *ha* Is this normal? Am I out of my mind!?