@kittytruelove777,
very simple... with a woman it's a whole process... Even if it's a f*ck-buddy, there's always some sort of ambience that has to be setup, it takes time, he has to satisfy her, get satisfied and in the end there's always that obligation of having to be caring and spoon or stay laying down... That takes about 30min... AT LEAST! Now imagine if it's with a love interest... you have to add at least half an hour on top of that
Now, when you jack off, you can choose the best porn, bang it out in 10minutes and you can go on with your life... Sometimes the guy just wants to relieve stress and doesn't want to be involved with the whole process of love-making. It's not that he doesn't love the woman or doesn't desire.. he just wants a quick fix... sometimes you don't want to have a full 6course meal.. you just want a snickers bar... get it?