If I'm really attracted to a girl I'm dating, I don't find myself craving other women. I do still look at other women, and I am still attracted to them, but it's not difficult for me to not act on it. I enjoy sex better with a girl I respect/admire and am attracted to and familiar with more than a stranger, and this for me is the single biggest reason I enter LTRs and am open to them. I am very picky and specific in what I look for in women physically, but I can still find women to sleep with. What's much harder for me is to find women I really respect and admire. Basic women bore and annoy me. When I find a girl I am 100% physically attracted to, but also really admire for who they are, what they can do, and their confidence, my attraction increases and it makes sex and everything else a lot better. I find that I'm attracted to women who excel in something - for example, some of the women I've dated recently have been elite-level runners who nearly always podium and I also dated a professional ballerina who got a lot of big parts in productions.
So that's the benefit of commitment in my eyes. All that said, I have never wanted kids and I don't want to marry because I'm not religious and I see no benefit to me - only drawbacks. I have also been around long enough to be jaded about commitment and marriage. I know that many women think marriage is going to bring them happiness and cure their internal fears and anxieties, and when they marry and find that marriage didn't fix their internal problems, they get angry and bitter and either cheat or divorce and then walk away with half the guy's stuff. Also, a guy I know recently had an ex of his who is now engaged to be married to another guy reach out to him just to hook up, and they did.
I'm still open to commitment with the right women but I spend no time craving it or thinking about it or setting it as a goal for myself. Instead my goal is to be happy with myself and have a fun, exciting life filled with friends and adventures and I've been successful with that. Women and relationships are great but I don't put hardly any focus on it any more and when I have dry spells, I'm completely fine with it.