My toddler just threw up on it.” I’ve recently met a new friend and I was thinking about our budding mom-lationship. And just like the other kind of dating, there are bases. She will see the layer of dried-on grime coating your kid’s chair at the table, and she will notice the unflushed dooky from your son’s morning dump. If you’re my third base friend, get ready for our boobs smashed up together while I ask how you’re doing right in your ear.
This is the first sexual behavior discussed so far that carries the risk of pregnancy or infection of a serious STD (Sexually Transmitted Disease), though this is not common. We've already talked about the risks of deep kissing, and there are no consequences to touching above the waist, or touching below the waist on the outside of clothing (some might argue that the risk to light petting is that it leads to heavy petting and that teens just cannot control themselves and will end up having intercourse - we disagree that teens have no control and believe that better and earlier, constant sex education will help teens remain in control of their hormones).
The greater risk is with 'heavy petting', petting below the waist and inside the pants and underwear, and then only if the same hand touches both person's genitals (meaning that when touching yourself and then your partner, you can transfer body fluids, including sperm, to your partner's genitals).
Something you should keep in mind is that many of these terms are informal and even slang, and therefore you should be careful with whom you use this vocabulary.
Also, some words and expressions might objectify women, so be be prudent with the context and ALWAYS respect women.