Is it normal to completely reverse one's sex drive?

I used to be very promiscuous, for a long time--- from 24 to 32--- I was pretty out there when it came to sex. Went to swingers parties, met up with a bunch of other men's wives, was involved in many threesomes, etc, so I used to be pretty open-minded and pretty flagrant sexually. I have never gotten married, but now I have been with the same woman for going on three years--- and she is the opposite of that. She won't even have sex with the lights on, let alone anything else that is more out there. She learned about my past a long time ago, and though I have never cheated on her- and never would- she still brings it up when we are arguing, etc. Well, in the last three years, I have completely lost my sex drive. It has gone from one extreme to the other. I used to go through three or four women in twenty four hours- now I go three or four weeks without sex. She wants sex more than I do. Is it normal for a person to completely go from being essentially a man hoar to not even wanting to be touched at all???