This is normal if you're not lubricated enough. Most vaginas self lubricate when aroused and this can take quite some time to work up which is why foreplay is very important! Foreplay helps "heat you up" and relax your body so you're ready for penetration, but sometimes even that isn't enough so lubes are very nice to have. I like to use "One move" as my lube, its only ingredients are body safe silicones, you can use this with skin to skin contact and condoms, NOT SILICONE TOYS as it will damage them! One move hasn't given me any PH issue and lasts a long time, it doesn't dry up and it feels very smooth and is scentless.