Wait.... do you hate your ex's watching porn after leaving you, getting boners without you, or did you hate them watching porn and getting boners when they were with you. How you wrote it, it can be taken either way.
The erection doesn't matter much, it's sorta like blowing up a balloon, you can feel it expanding with your lips like a extention of yourself. It's like that but also more solid and putty like, like a bloated sausage expanding in the microwave. The erection itself does nothing by itself, we get no pleasure from the erection, it's how it is touched. The neural contact.
You know..... I'm guessing it's like hemmroids. I never had hemmroids, but know women tend to when pregnant. It's just something sticking out of you, but is certainly more comfortable than hemmroids. It's designed to be this way, hemmroids is a accident of anatomy.