Is there something you require other than via the penis to keep you are hard?

I was doing some alternative masturbation techniques. For as long as i can remember everytime i masturbate inwould be touching my nipples simultaneously. In my previous relationship i had zero erection issues. In reflection i know that my girldriend would consistently and constantly pleasure my nipples almost throughout sex like she knew i needed it. Now, during my recent alt mast session i tried not touching my nipples and i found it challenging ti not only cun but also to maintain my erection.

Do other people require constant help to stay hard orher thwn via the penis? How do i overcome this because i dont want to ask every sexual partner to constantly massage my nipples.