Religious couples tend to have the most fulfilling sex lives. Conservative religious couples have the best:
https://www.dailymail.co.uk/news/article-7060099/Highly-reli...Myself, as a highly conservative married man, my findings confirm the daily mail article, esp. when I look at the sex lives of my married friends who were more libertine in their youth.
EDIT:
A few theories:
1. My wife is not on birth control, which means she ovulates, and thus has the normal cyclical female sex drive. Her desires during ovulation are way past mine, even if my average is higher than hers. I believe this is why modern men feel so undesirable -- most women are taking hormones that directly affect how attractive they perceive their men to be.
2. No points of comparison. I have no point of comparison with other women. At this point my sexual response, probably through repeated exposure, is finely tuned to my wife. I have fantasies, like any man, but the vividness of my lived experience far surpasses them in excitement.
3. No pornography. I'm not saying I've been perfect, but my religion believes that consuming pornography (same with masturbation) leads to hell, so it's not something I typically do. I have a high sex drive as a result, and instead of masturbating, we have sex instead.
4. No condoms. Similar to number 1. Sex without a condom is better. We tried it once (in violation of my religion) and it was awful. I wouldn't describe it as the same experience. I'm pretty sure there's something in each of our secretions that makes no condom sex better. I'm not a sex scientist, but this is my observation.