by his standards they’re not more sensitive than anyone else’s, but if human ears are a common erogenous zone i think it’s safe to go with fandom’s assumption elvhen ears are more so! so that’s a bit like saying “my nipples are not more sensitive than anyone else’s”. he’s had his fair share of moments spent with his head in telana’s lap while she plays idly with his piercings, etc. it probably registers as the same level of pda as a partner sitting on someone’s lap in public, or a hand stroking the small of someone’s back. not exactly polite but not explicitly lewd either. if sometimes drakon has done the same that’s no one’s business.
he would remove his earrings for magically enhanced sexual escapades, but not because they inhibit his mana! the pairs he wears in the dragon age (such as the one he shows to asha) are inhibiting specifically to counteract his mana disregulation; for the bulk of his life, since the last couple years of his apprenticeship onwards, he’s actually worn mana enhancing earrings. he takes these out before sex not because they make it more difficult to experiment with magic, but because they make it too easy, and they’re trying to have a good time not a hazardous to the city block time.