Try using Lubricants like KY Jelly. It helps you stay moist! Also more foreplay will help you naturally stay moist..Have fun!
Go get a vibrator. Not one to put inside but one to play around the clit with. I can't say I have the same problem but I stay wet longer and if you are not in the mood it will put you in the mood. Make sure you have a towel handy, squirting happens. The vibrators are great for foreplay and make sure you get one with multi level option.