Been with my sweetie for a year and a half, living together for about 2 months so far. Things really have been cooling down. Sex is less often, and sometimes less passionate. Complimenting me less, etc. But I've been talking to him about it lately and things are really looking up. There isn't enough positive stuff to say about communicating with your partner about the things that bother you! For example, we were in bed last night, kind of tired, no intention of having sex. Started discussing our sex life and fears and desires and ideas and so forth, came up with a couple of ideas of things to try in the near future (when a couple of new play things come in!). And that talking led to kissing, which led to some of the best sex we've had in a long time. The closeness of opening up and getting things off our chests is a pretty effective aphrodisiac. Every couple has their ups and downs, what's important is that you confront it with a level head and understanding, not finger-pointing and "You don't do this anymore!" and especially no "You're starting to behave like my ex!"