If you want a natural nitrous oxide lubricant- the stuff in your blood that is responsible for making your dick hard- eat some celery every day--around 4 stalks or so. I thought it was b.s., one of those old wives tales---but man does that work. I read about it in the marquis de sade's memoirs. Apparently that's what the libertines used back in the day in France. Guys who were good at fucking and seducing back then would use those skills to advance their careers, so it was no joke.