When an individual is having sex with more than one person. They are mixing sexual "germs/secretions" from one person to the others in which case they are mixing sauces.
"Bro, I have herpes but I don't know who I got it from?!"
"Dude, you have gotta stop mixing the sauces.."
"I am so not into just her anymore man, I am gonna just mix some sauces."
Making Eye Candy is when you stare at someone male/female, long enough that you start to play sexual fantasies of them in your head. If they're only moderately attractive they can become drop dead gorgeous if you look at them enough.