[The_Infernal_Dante]

I'm not a doctor, and none of this should be viewed as medical advice. But in my personal opinion, not really. You're exposed to STDs via the mucous membranes in your nasal passages not to mention whatever else you snort up with it. Unless you're snorting semen straight from the source it's bound to be cross-contaminated and even then you could catch something from their urinary tract. Plus inhaling any sort of liquid can result in it being inhaled/choked on.