Getting wet

Is it hard for anyone else to get wet often? Me and my boyfriend are in a long distance relationship so when we see each other we tend to have a lot of sex but its like after the first time we have sex I can’t get wet again. And we are only with each other for a couple days since our work schedules are so different. I’m horny but not wet. Does this happen to anyone else and does anyone know how to fix it or know why its happening ??