2 doctors weighed in:

What sex positions can help men maintain an erection?

2 doctors weighed in
Dr. Edward Goldberg
Internal Medicine - Gastroenterology
1 doctor agrees

In brief: Whatever Works!

There is no specific position that will better enable a man to maintain his erection.
Most people have particular desires regarding their "favorite" positions and it's a good idea to stick with that one if you're having erectile difficulty. A constrictor (aka "cock ring", which can be found online or in a sex shop) properly positioned, is a natural way to help with erections.

In brief: Whatever Works!

There is no specific position that will better enable a man to maintain his erection.
Most people have particular desires regarding their "favorite" positions and it's a good idea to stick with that one if you're having erectile difficulty. A constrictor (aka "cock ring", which can be found online or in a sex shop) properly positioned, is a natural way to help with erections.
Dr. Edward Goldberg
Dr. Edward Goldberg
Thank
Dr. Leto Quarles
Family Medicine

In brief: Depends - experiment

If the main problem is maintaining enough blood flow to the erection, passive positions (reclining with partner on top, side-by-side) are usually helpful.
If his problem is being less responsive overall, whatever position(s) he finds most stimulating or exciting will work best - every man has different tastes. Men tend to be visual creatures, so an arousing view of his partner always helps.

In brief: Depends - experiment

If the main problem is maintaining enough blood flow to the erection, passive positions (reclining with partner on top, side-by-side) are usually helpful.
If his problem is being less responsive overall, whatever position(s) he finds most stimulating or exciting will work best - every man has different tastes. Men tend to be visual creatures, so an arousing view of his partner always helps.
Dr. Leto Quarles
Dr. Leto Quarles
Thank
Read more answers from doctors