Stuffing a packet of skittles up your pee hole so that you cum different colors into your partners mouth.

Tasting the rainbow

When you eat a full bag of skittles and then let your gf or wife give you a blow job

Then whilst cumming in her mouth you whisper taste the rainbow in her ear

When your wife, girlfriend or one night stand masturbates with a variety of different flavor popsicles prior to you going down on her.

When you climaxing and your cum is the consistency of the original skittles.

Performing oral sex on someone who has eaten so much skittles that they came literal rainbow coloured semen. Oh also it tasted like skittles.

When one peels back their foreskin, and put skittles inside of it before ejaculating. Preferably three, and has someone suck them out and states "Taste the Rainbow"