Agree with fourpaws above. I think you need to get your husband a book on anatomy and tell him you will not have sex with him till he reads it. By then there should be a whole new understanding and appreciation as to the female body.
Thats like there are times he has a lot of very liquid semen and at times there is very little and thick, and during the latter its because he had sex with someone else. If that is what hes thinking dear nothing you say is going to change his mind.
I can't beleive he would say that! Your vagina changes due to many factors. The more aroused you are the wetter it gets, if your not too aroused it feels tighter. The vagina is made to stretch! Does he know about child birth? I wouldn't say your abnormal, he sounds like he needs a crash course in the female anatomy. It's completely normal!!
Yes I think so sometimes it's a tight fit, sometimes its easy I think its completely normal. I would be worried though as I find someone who accuses cheating is sometimes guilty themselves