I want to be more adventurous sexually but feel my partner doesn't. He thinks I'm crude. He was in the past with others so why not with me? I know I'm not his usual type could that be the reason why?
It could be that he views your relationship differently to his past experiences. Possibly his previous relationships were about exploration and "sowing oats" and that his relationship with you is more about a stable loving relationship. It is also possible that he is not used to having a partner who is upfront about what her sexual desires and needs are. I would recommend that a conversation be had where you can express just how his rejection of what you are looking for is effecting you. It is possible that he does not realise that his approach to this is causing you distress. Openness and honesty is important in all relationships and sex can be a very sensitive subject. If the two of you love one another, there is always a way forward.