Varies, I look at porn, shemale porn, I cross dress (usually wear my wifes panties) I use a vibrator or dildo on myself, I sniff my wifes panties, I wrap my wifes panties round my cock, my wife will often get on all fours on the bed so I can sniff her pussy and ass while I have a quick wank, the list goes on
It depends what mood I'm in, how much time I've got and whether the kids are home or not.
Baz.