Backstory: The SO and I have been dating for almost 3 years now. We are both in our mid 20s and have been sexually active for a large percentage of the time that we've been dating. As is common I'm sure, the "honeymoon" era of the sex and relationship was wonderful - though it usually always is. This time-frame lasted around a year to a year and a half, but since then the sex and concurrently the relationship have been in a somewhat steady decline. Whereas we might have had sex a few times a week that was both passionate and adventurous back then, now we go for weeks at a time between with mostly little interest until one of us is near climax. She's explained that it's natural for women to begin to lose some interest in sex by our age, and that it isn't me or our relationship that causes this. I don't voice this opinion in a rude/uncaring way, but this seems more an excuse than anything else. I'm a very sympathetic, loving guy and always invest plenty of time into making sure she's happy and attempt to appeal to her intimate side. After reading/lurking in Vag for a while, I realize that she could simply be bored because I'm treating her as I am. Her previous relationships haven't been with the greatest of men, and I'm beginning to think that though she's stated she wants a gentleman, what really interests her is someone that doesn't necessarily treat her well. Sex is a very important/healthy part of a relationship, and the lack of it and/or passion in it leaves a hole as well contributing to me doubting our future. I've always been the first to try and talk through problems, but she insists it isn't a problem but a logical progression of events. Where to go from here is a mystery to me. I really want to stay with her, but I'm beginning to lose interest in our relationship due to this (and yes, she's aware of it). Life is short; I refuse to spend it in mediocrity when what we had was so much more. (And no, she isn't the sort to cheat. Besides this, we live together and if it were happening it would have to be masterfully hidden for me to see traces of it.) In summary: Is a decline in a couple's sex life normal? Should I accept mediocrity or begin to look elsewhere?