Why is my husband doing this all of a sudden?

My husband and I were in bed and we were kissing and rolling around ontop of eachother and about to have . But then I put my arms up and he accidentally touched my underarms. We are newlyweds so we havent really discussed ticklish places. But I am VERY ticklish under my arms and I jumped a little and I giggled. He got a big smile on his face and he touched me there again. He was ontop of me so there wasn't much I could do. He's kinda buff too. He's got a six pack and everything :D. Anyways, so he started tickling me lightly, and I didn't have a problem with it because I love him and it was fun :) Now before you say he doesnt wanna sleep with me: we have had many times before, and we have had it since then. I intend to get him back for that though. It's a game that he's been playing with me ever since. He will catch me off guard and just grab me and tickle me. But i dont know what this means. Does he just like tickling me or does he have a tickle ?? I don't know. I like him tickling me but I'm just trying to understand what he's thinking. His name is Hayden :) I love him to death!! And another time I had just gotten home from work and I was putting my stuff down and he ran outta the bedroom and he grabbed me and just started ripping my clothes off (he had a bad day) and after we did it he was laying beside me and he started tickling me on my sides, then we just kissed and I tickled him and we have just been having episodes like this alot. I DEFINITELY dont dislike it tho :) Just wondering if anyone has any thoghts. Thanks!!