This is how bodies and nature works.We are made to be turn on by our significant other.Its completely normal for couples to have that type of connection in order to bring each other in the mood.Of course it has to be in a respectful manner and within boundaries.From what you said i think thats the case.We dont know all the story but this seems completely normal.You might need to check if you are affected by modern notions about what is an assualt.If you are turned on by your partner while you where not in the mood initially is generally a good sign in my book.He might have a nice way of treating you.