Hard climax

I don't know why it is so hard for me to get off but I rarely ever do. Its not bad sex because my husband definitely knows what he is doing. I will get so close then it will just go away. We mainly have "quickies" for sex now so he can get off. When you do have actual sex with a lot of passion it can last 2 to 3 hours. (Not complaining). But he is discouraged and feels like he's doing something wrong because I don't get off. I've tried k&y; and other creams and gels nothing has helped yet. Any advice that would help?