Dream of having sex

Im a women with a very nice young friend 13 years younger and he has been there for me through some very hard times and i have now dremt about 4 times having sex with him. a couple of months ago we got drunk and ended up in bed but said it was silly and atgoodfriends so why do i keep dreaming of how good he is. some occasions he says no but most of time he really wants to before he says no. and last couple of times we have. i was getting over someone eles and ive been back in touch with him to try stop this and its still there and still so good