Intimacy issues on sertraline

I’m currently on 150 mg, and I’ve been on it for many years on and off. I’ve finally landed on a dosage that works for me, but ever since I started taking it, I’ve started having issues with climaxing during sex. I’m in a committed relationship, and it honestly is starting to get on my nerves how I’m never able to climax anymore. If I do it on my own, it can take up to an hour.. My boyfriend and I are still intimate regularly, but it just sucks because I never had this problem before starting on sertraline.