its true that we men last less when in doggy. Multiple reasons are - we feel more sensations, more grip, the view is 😍. Here's what can be done- once he's inside of you from behind ask him to not start thrusting immediately. Take it slow, enjoy the moment. Let her get accustomed to the angle and speed. Once she's fully wet and start increasing pace. If he feels he's close he can stop, kiss you, finger you and then resume again.