My penis is curving & testicles are coming out so fast

If you are talking about your penis curves to the left or right, some are just that way. Some look like the have been bent and end up with a sharp curve,can be any dieection. The best way too prolong having sex is to slow down or just stop for for a short while,less than a minute,untill the feeling like your going to cum subsides. You don't have to pull out , just stay still. Do this a few times, and when you do let loose, it will be great! Also if there is a position where she gets pleasure, but doesn't do a lot for you , indulge her, and you can switch positions when you are ready to something more stimuating for you.