Human sexuality

I don't understand why people are made to feel bad about having sex. Why? It is a natural thing. Everybody does it. Even your parents. Almost everyone I know & have talked to about this, cannot image or think about their parents having sex. I think it's great to hear that my parents still have sex (they have been married 42 years). Is there a maturity that allows you to feel comfortable that everyone has sex & that it is natural? I have been thinking alot about this. I want to know why some people have a higher sex drive than others...is it psychological? I work with a woman who was made to have sex with her husband every single day(whether she was sick or had a migraine or her period) for their entire 18 years of marriage. She is now divorced. She does not enjoy sex at all. But she would like to want to have sex with her boyfriend. She is still having issues with it because of the abuse.
Almost all the women I work with seem to have very low sex drives. Why do women have low sex drives? I don't understand because I have a very high sex drive.
Is there something wrong with me? Am I not normal?
I will admit, I am NOT normal. I am a very weird woman. I have never been normal. I don't believe there is a "normal" person. We are all unique. But I can't help but compare myself to these other women. Why can't I find another woman who has a high sex drive like me?
Maybe it is because I was a late bloomer? I was 33 the first time I had sex.
Does anyone know if there has been a study done correlating the age they first had sex with their sex drive?
Sometimes I think I have a higher sex drive than my husband. The stereotype of men is that they have really high sex drives. But this is not true of all men, or at least not all the time. I have to be careful not to take it personally when he doesn't want to have sex, sometimes I feel very rejected.