Sex help

Sometimes I find it hard for me to get wet if I’m with someone I’m not in a relationship with. Idk if it’s a mental thing or if they’re not trying to get me aroused enough but how do I make it stop???? It’s really annoying when the sex feels good but I can’t cum or fully enjoy because I’m a little dry ... how can I get over this? Any tips to make the sex better or help me calm down?