Staying wet

This may be tmi but, idk where else to turn other than the ladies who are also ttc. My husband and I have an issue with me staying wet. I can stay wet during the entire time we are having sex, until I orgasm. Once I orgasm its like shop closes up. It becomes very frustrating. We haven't gone as far as buying lube or anything yet. Is there any natural ways to help this? Does anyone else have this problem? HELP!!!