<human>: Can you summarize the given text in a few sentences?

We've been dating for around 5 months now and everything else in our relationship is going great but she likes to have sex a lot more than I do and she's much kinkier than I am.

Most days she wants to go at it no less than 3 times and I would be lucky to be in the mood at all once every few days. And it's not that I don't find her attractive, I just don't have a very high sex drive and it has never been a problem in previous relationships. She insists it doesn't bother her when I'm not in the mood but I can see the disappointment on her face and it kills me inside.

So when we do have sex, I step outside of my comfort zone to accommodate her. She's into S&M and light bondage kind of things. I'm trying to broaden my horizons but I can't get comfortable with certain things like choking her even though I know she enjoys it. 

We've talked about it a few times before and set limits but I feel like I just can't keep up with her sexually. What can I do?
<bot>: My girlfriend wants much more sex than my libido can keep up with and I'm not comfortable accommodating her kinks despite my best efforts to try.