I've read and reread your question and I can't make sense of it. Not entirely, but luckily enough to take a stab. Oral sex and subsequent pubes in the mouth. Got it. As an 18 year-old you are presumably beginning on what could, nay should, be a long and winding, fulfilling sexual road. Filled with ups and down, lefts, rights and right up the middles. If you're with the same person for the next 70 years or 70 people over the next 25 years, the facts don't change. Pubes will get caught in your throat, in your mouth, wrapped around your tongue, lodged between teeth, curled off your lips and the like. Pubes will land in your socks, your toothbrush, your morning coffee and windowsills. It's just a bi-product of tumbling around with an human being. As for etiquette, most pube grappling (gagging, spitting out, etc) is done on the down low the first few weeks and months of a relationship. It's a sly act, involving licking a pillow when he/she isn't looking, or rolling over to the dark side of the bed and feverishly pawing at your tongue when he/she goes to get the condom. As the relationship progresses, the curtains part and the wider scope of the human sexual experience is shared. Queefs, farts, morning breath, cellulite, orgasm faces, pubes and all.

*Yes, if both parties are shaved hairless this drastically reduces the pube concern. But fear not, most men's chest hair can fill in just fine.