I am the exact same way. I've only been in 2 relationships but at the beginning because it is new I really enjoy the sex, I can't wait to do it. After about a year, with both, it's like ok I'm done now. I literately could go the rest of my life without sex, it feels that way anyways. I love my hubby so much and feel I have a deeper connection with him than him with me because he always wants to have sex and he seems happiest after while me I love him and am happy with him in all the in between times....It is strange I must say but we are who we are.