Exactly what the title says. I'm less interested in the standard "masturbate beforehand" or "distract yourself mentally" tips and more interested in hearing from guys who feel like they have more muscular control of their pelvic floor etc to keep yourself from going over the edge. What do you do? Try to relax your muscles? Try to squeeze them?
Kegel exercises have helped me with controlling my orgasm. For me it was after about 3 - 4 months of daily exercises where I saw significant changes. There are many references on the internet for the routines that you can perform.
Also, one thing to keep in mind. Is to put everything into the proper perspective. Premature ejaculation is when you release after a minute or so. And there are alot of guy who consuming quite a bit of porn where the scenes are 15 to 20 minutes long and they think this is normal. And it's not the reality of sex in real life. Case in point, my partner and I were with another couple. A young couple probably in their mid 20s. And they were noobs. So my partner finished off the guy finished off in 5 minutes or so. Which he thought was too fast.
And we explained to him, that it was normal. Because he went from start to finish without taking a break. Also my partner, she's physically attractive and skilled in sex, so guys will typically cum around 5 minutes give or take a few minutes.
So keep your expectations realistic about how long you should last.