Being a one hit wonder and scheduling 2 hour sessions or longer...I prolong my orgasms quite frequently.
The key is foreplay...foreplay...and more foreplay.
Body worship, massage, kissing and cuddling, massive amounts of oral sex (DATY, DATO,69, BBBJ). I also like to suggest we both take a shower (or two) so we can play in the water...which is always a good time and can be totally erotic.
Plus its good to have stamina!
Fucking to me, is the grand finale...but I never deny a lady when she is really wanting the cock. That's where the stamina comes in...
If you really want to prolong your orgasm, just be creative.