Thorny subject for me; the combination of paid sex, condom and work stress all serve to delay my orgasm and I can find myself unable to come if the room is too hot, or the girl not hot enough! Sometimes I get lucky, best yet was a 50 minutes of oral, tit wank, penetration, Prostate massage and wanking before Miley finally got me off (in to her mouth) to an epic finale ( I am probably risking a heart attack, but I cannot think of a better way to go!). She declined to swallow and told me many of her customers would feel lucky to have a load that size!
I frequently have to help myself at the finish, being chilled, abstaining prior and good rapport all help.
Dave