But I don't think you need "thrills" or experimentation to have an interesting sex life with a longtime partner, just an interest in knowing and loving them deeply and intimately. My own sex life with my partner didn't die for lack of experimentation, we just kind of lost that spark plus health issues limited her interest.
This. The wildest, most fulfilling nights we had with my wife happened many years after we got married. Not because we experimented a lot - mostly because we had more experience in having sex with each other: knew what makes as go wild, how to tease, stimulate, push over the edge time and again.
There is also the fact that a lot of people need time in order to fully open up to someone else and intimacy means being vulnerable - showing another person your true self without any barriers. Getting there takes time.
