As I have got older I sometimes like to have a much longer masturbation session with a lot more time leading up to the orgasm. A lot of this lead up time I'm not directly stimulating myself at all. Looking at sexy stuff on the net, videos, reading stories, etc.
One thing I have found I like is to pee in my pants. When I'm hard or semi hard, it's hard to really urinate full on, but by relaxing and contracting the various muscles I can pee a little at a time. I think the peeing makes me more horny, and harder and that stops the peeing.
I also like to wear womens underpants when I do this. I have on two pairs of soft cotton boyshorts and a pair of black pants over that. I pull my penis up out of the leghole of the inner pair so it is between the two layers of soft absorbant cotton. So I pee a little at a time and feel the warm wetness. Sometimes I go outside and work around the garden while I do this. With black pants on you can't tell they are wet unless you get up close and really look.