Personally I always used saliva to get into a pussy at first... Then when the intercourse go on I dont need to re-lube my cockhead even if I pull it out to change position or to take a litle rest unless the break is too long. If the break is too long I need to relube it since the pussy would have dried in the meantime... Now this is pretty common in porn moviea too.. It only happened once to me to get inside a pussy without lubing my cock and it was with a one night stand partner... She had long meaty pussy lips and was wet as fuck..actually the largest and wettest pussy I fucked.. Very few feeling for my poor cock..she would need an xxl cock from lpsg..ok but thats another story!