Nerr I don't agree with the 'yuk' and 'deal breaker' although we are all a reflection, to various degrees, of our own societal conventions generally, so it's more a societal reaction than necessarily a personal/controlling one, which it would be if a man was asking about his wife getting her ears pierced - because that is (rightly or wrongly) currently a societal norm so it would be far more of a personal than a societal objection in that case.
It IS up to a grown adult if they want tattoos and piercings but if it's outside of societal norm then it is going to create more notice or interest.
Also most of us take into consideration to some degree or other what our partners/families/friends/workplaces think of 'against the norm' looks.
To some, the 'perfect' society would be where everyone could wear everything without question. But to others, it's 'perfect' to them that there are boundaries and conformance to certain looks and styles. Sometimes, I agree, it seems unfair like when (as you say) women can adopt whatever masculine look they like as well as feminine and that's fine, whereas it's far more restrictive for men.