A bit of whiskey works for me. Just enough to get my engine revving but not enough to encourage me to fall asleep.
His aftershave, her perfume... Sweeeeeeeeeeet Monkey Jesus that stuff smells good. If I get either of those scents on my clothes my whole body hums the rest of the day.
Of course, living with two incredibly sexy people is enough to keep me fairly ready to go at any time.