Hello sir,my question is related with pain during and after sex, during sex my penis cap was not fully goes up and that creates a problem for me because when I put in without any sucking or any lubricant, it stays dries and it pains so much. So what should I do? Do I use lubricant before sex if yes then what is good for me water based or synthol, I have a good stamina so I also wanted to know that which lube is best for me...