I am so glad I don't have to resort (no holiday place type pun intended) to artificial stimulation.
Try this. Go out early and just get pissed on lots of beer. Pick up a girl and get her drunk also. Both stagger back to your room and then collapse in a drunken stupor. Got the picture so far...
Then in the morning you WILL wake up with a raging hard on But don't go for a piss just yet. Go for it big time...
It works for me... with no advers side effects except stomach cramps...