Hey fellow glow users!

So my boyfriend and I have noticed that his lips get chapped one/two days after he goes south :P

We went to a Boots pharmacy and a pharmacist there called them cold sores and said it's due to Herpes. We obviously didn't believe him since I've never had intercourse or even oral sex before...

So he uses a lot of petroleum jelly on his lips when we do it. It has helped. He doesn't complain of stinging lips now. Has anyone else experienced this? What's the possible cause?