More along the lines of time of day (morning,afternoon) but also how often? Also anything that makes you especially want to do it?
Whenever I ask politely for a fuck or suck and am denied. My first impulse is: go out and fuck someone else. Then the superego's rejoinder: you cannot fuck other girls; that's cheating. "Oh yeah," I remember, "for some reason I am still in a relationship where my partner apparently has rights to where I put my cock or on whose pussy I put my mouth." In a true relationship based on trust and a belief in the erotic, I would instantly be over some other girl's place, because making love should be as simple as having a drink of water, in my view. So, long story short: I have to jerk off in shame, and secretly, or else I will be insensitive to her feelings. As if she sees some porn slut or whatever that I'm jerking off to, it may make her feel hurt, for the girl may have some feature that is too offensive. And the jerking off is always mediocre.
If some thing makes me horney, my dick usually stays hard until I wank it off. It can happen almost anywhere any time of day.
I have a very high sex drive and even with sex several times per week I usually masturbate either in the morning or evening about every other day.
Wow, little on the dramatic side aren't we? Though I must admit an interesting read and yes rarely I've caught myself thinking similar thoughts, but they last about a half a second and then reality hits me like a brick and I'll shake one out if needed. Reality check for you though is most woman don't view sex as men do. They don't look at it as some casual drink of water. Which is probably a good thing too (or so I'll keep convincing myself) otherwise our world would be very overpopulated...