I been in a relationship with my girlfriend over 1,5 year. We have great relationship, we do stuff together, we go places, etc. The problem is that in last 6 months our sex drives dropped dramatically, we have been living together for past 8-9 months . If in first 6-7 months we had sex almost daily (4-5 times a week), now we barely have once every 3-4 weeks. I tried pretty much everything, dates, different places, different time. I talked to her multiple times, she tells me she loves me, she wants to be with me forever, etc, etc. When i start talking about sex, she tells me, "not tonight" I'm not in the mood", "tired", I have to be at work tomorrow early" and so on. I love this girl, but have sex once a month, doesn't work for me. Every time we have sex now, it fells like she just doing her girlfriends "job", there is no passion.... I'm in desperate need of help.

Try heating her up during the day.

Starting with dirty little text messages here and there. Build the sexual tension up till it's time.

Easier said than done.

OP: i guess she is resistant if you try to escalate?

I been in a relationship with my girlfriend over 1,5 year. We have great relationship, we do stuff together, we go places, etc. The problem is that in last 6 months our sex drives dropped dramatically, we have been living together for past 8-9 months . If in first 6-7 months we had sex almost daily (4-5 times a week), now we barely have once every 3-4 weeks. I tried pretty much everything, dates, different places, different time. I talked to her multiple times, she tells me she loves me, she wants to be with me forever, etc, etc. When i start talking about sex, she tells me, "not tonight" I'm not in the mood", "tired", I have to be at work tomorrow early" and so on. I love this girl, but have sex once a month, doesn't work for me. Every time we have sex now, it fells like she just doing her girlfriends "job", there is no passion.... I'm in desperate need of help.

How often do you see each other, now that you're living in the same place?

Correct, she is. She says to me a lot, "lets plan sex". For instance, lets have sex on saturday night. Or lets go somewhere for few days so we can have some fun. So whenever saturday comes, she is not in the mood, or she is tired. I tried to play with her push-pull, didn't work.

And you're fine with planning sex?
I mean if you're out and start sexting that's one thing, since you're gonna meet up in 45 minutes, but planning sex for Saturday?

Seriously.

Hmmm....

Has anything changed? Have you or her put on weight? Was the sex good? New job? Schedule change? Depression?

Simple answer, she's not attracted to you

60 hours a week each is very grueling. How is your own desire? You might want to ask yourselves whether you are making sex an obligation because you both know it's important to a relationship, and you especially know that the road of no sex is a road to death. However, how much sexual attraction are you feeling or creating in her? It's easy to feel like you "should" be having sex without actually NEEDING it. Maybe you feel that way but maybe she wants sex and to have a relationship with sex but when push comes to shove then she doesn't feel motivated to do it. Either way, amp up your own sexual attraction and flirt with her, build up anticipation over the period of a few days before trying. She then can prepare herself mentally to make the commitment to sex. Give her a few days though, don't be sexual and then expect it that night.