Any other ladies have this issue?!

Kasey
Help! I've been with my SO for 5 years and I am totally turned on by him, but sometimes I can't get wet... It's not always a struggle but I'd say 30-35% of the time we have sex it's a huge issue. And well that's no fun. Last night I was into it and so was he, but then boom dry as a bone... 😔 any suggestions at all?!? 
PS we are in our mid 30s...