Explain your needs to him in an open way. If it's important to you - it has to be out in the open that you will need things from him. He has to be responsible for his part of the relationship.

I'm also someone who loves sex. But in my marriage, it's not just part of it. We have sex about once a year. You may be looking at that type of future with him if things continue. Were you guys thinking about getting married? If so, you have to work it out or else it will become something that will irritate you ongoing.

His 50 ONS's as he was younger probably just destimulated him from sex. About the worst sex-partner you would want is a porn-actor. Second would be someone who had a lot (though 50 is probably not a lot) of sexual partners. You want your sex to "mimic" your real life together. If you you have fun outside of sex, your sex should also be fun. Your cooking together should be fun. Your commute to work together should be fun. If it doesn't and you have a "he is the one" relationship - then go to a sex therapist and also a medical doctor and work this out.