MY boyfriend doesn't want sex as often as I do
Well I've been with my boyfriend for 1year, it has been wonderful with ups and downs of course. We get along great have a mutual understanding with each other and respect. But there is that one part of the relationship that really bugs me. When we first started dating we would do it about 4 to 5 times a week, that was great for me, but there is that part of his life which is his obsession and that is running marathons. He loves to do these things, now that we have been together he started doing two of them in a year, he tells me he feels great right now and he loves to run. But when he is training we have less sex, maybe 3 times a week or sometimes just twice. I don't know if I'm just too demanding, last night we spoke about this and I told him I wanted more sex in the relationship, he told me that I concentrate and think too much about that part of the relationship, that there are more important things, I mean when we are together intimately we are so much alike in the things we like, man its amazing he's always interested in pleasing me first before himself and maybe that's what I want more of. Then my mind starts to wonder and I start thinking maybe he isn't interested or he has someone else. I guess that is the first reaction. Please give some advice on this, am I being too demanding of him and should I respect his love for running.