Sexually frustrated at 26 weeks.

I am 26 weeks pregnant. I been having very vivid sexy dreams at night. I am so horny all the time. My husband and I do have sex but I just feel like he gets on top and boom its over. I remember us having a great sex life before. He says it is the long hours he is working. I am really scared to actually confront him. I wanna tell him I want the old sex, the kinky, playful exciting sex but I'm scared. I do not want him to think I do not appreciate him . I lay here and cry myself to sleep and I am so frustrated that I wanna freak out. I want what I want but I'm to scared to ask. I feel so selfish. I cannot just forget about it tho. I have tried. I have two other children. One with another father and one with him. With our daughters pregnancy he was so experimental. I'm 30 and he is 35. Is this an age thing? Is it my pregnant body? Or is it really his job? Am I being selfish? I know waiting for the kids bedtime might be hard but this is really messing with me. Help!!!!!