Kissing boosts immunity. There's no denying the fact that when you lock lips, there are bound to be some germs, uh, exchanged. One specific bug can be particularly hazardous to pregnant women, but researchers believe kissing is a way to introduce the virus to a woman in small doses before she conceives, triggering her body to build up a resistance to it before she could ever pass it on to a child, according to Popular Science. However, if your partner in crime is visibly ill, it's still a good idea to hold off on that kiss, as it's still an easy way to catch mono, strep throat and herpes, among other things.
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