There are many benefits to CR, but I think there are also some detriments for some folks. I think it also depends on the amount of calorie restriction. For example, mild calorie restriction, a 20% reduction of calories, in mice is reported to have no effect on testosterone levels.
There are natural supps that increase libido. I bet that they might work for CRON folks if that was an issue.
One person's response on CR from
http://www.psycholog...n....xml&page=2"Many CR practitioners lose their sex drive. How is that healthy?
Obviously, it's not for everyone. When you're on the high testosterone side of the fence and your libido is going strong, it's virtually impossible to see the appeal of the side of the fence that I'm on now. Some veteran CRonies, but not all, have observed this virtual disappearance of sexual desire. Like most men, I used to think about sex many, many times a day. It's inconceivable to think about not having that as a large focus. Now, however, it's very hard to see the appeal of going back to that testosterone-driven way of life. I don't miss my libido one bit.
One of the biggest difficulties for my wife is that I'm not as attractive and she isn't as attracted to me as she used to be. But psychologically and emotionally, she's much more attracted to me now. I'm a much more considerate husband and father than I was prior to starting the diet. My testosterone is extremely low, in the ballpark of an average woman."
I also noticed a dramatic decrease in my sex drive.
Many other animals, including primates, have dramatic decrease in sex drive and reproduction during times of CR due to natural forces. The reason for this is that sperm takes a lot of resources to produce. As the body adjusts to CR, it chooses survival over reproduction.
If I add a meal to my CR regimen, I notice a dramatic increase in sex drive within 1 hour of consumption. However, my body fat is 4% and I am on 40% CR.