If you’re dealing with a partner of the premature variety, this position is a pretty solid place to start. Before (or regardless of if!) you switch to a penetrative sex posish, have your partner go down on you, alternating light finger strokes on your clit. Starting with oral takes the pressure off of both of you: you’re more likely to finish, and so he’s less likely to stress about “letting you down” if he orgasms immediately later on.
With your partner kneeling back on his legs, he won’t be penetrating you *quite* as deeply. This way, the sensation isn’t as intense as other rear-entry positions. With your legs wrapped around his back, you can control the speed and rhythm to better prolong your love-making.
Similarly, this knees-up number allows you to use your feet if it feels like things are moving too quickly. Slow him TF down and establish a feel-good rhythm that won’t be over before it started. Plus, you’ve got a couple hands free for whatever else you’d like to do down there.
Lie on your back with your right leg bent upward. He straddles and enters you in this modified missionary position that allows you to gauge the level of penetration based on how far or widely spread your legs are.
When in doubt, try something HARD. Standing sex positions are notoriously difficult because you need to engage a lot more muscles to maintain your balance. Chances are, if he’s concentrating on not falling over, he’ll be distracted enough to last a little longer.