Is hard to find such a man in this generation. Is OK to be worried. That you are worried does not mean you wanted sex. Is only someone that’s not sensible that will not be worried especially in this generation.

Now, I think you should take your time to know him better. If he should marry you, at least you should see him naked or erect even if the relationship is no sex until marriage. You need time to get to know his sexuality before marriage. Talk things through with him, may be not on this first visit but other ones. Ask him questions if you have one. If he is going to marry you, be open and ask him questions.  What are his believes?  When he is answering your questions, concentrate on his actions because action speaks louder than voice. You need to know that both of you are sexually compatible. His action is commendable but you need to be sure that all is well before marriage. Being sure is not a sin.