Insight on aversion to giving a woman oral?

Tldr: I'm curious for opinions on why some people don't like giving a woman oral.

A question for those who don't enjoy giving a female partner oral - can you give any specific reasons why?

Partner and I have been together for 15 years, met very young, each of us only had one other experience with a partner before meeting one another, and the first couple of years were a learning curve. Neither really knew what we liked or wanted, but he has only tried giving me oral a handful of times in our relationship. His reasoning is that he has a short tongue and it's difficult for him. It's been at least 5 years since I've received oral.

I know some people have reasons, I suspect my partner would not give me an honest answer for fear that it'd hurt my feelings. I am a super clean person, healthy-ish, I don't usually have an odor unless I'm working out or in the garden digging in dirt. Humans are stinky, sometimes. I'm not referring to these times.

He is very keen on smell. The normal odor of a woman, I know it exists despite the million products out there meant to erase it, but is it an aversion anyone else has so strongly?

Another is shaving. He has made comments before that the day after or following days, the stubble brushing his skin is irritating. I imagine this is actually true. I have thick dark hair that feels like a brillo pad when I don't shave (damn French genetics)... On the face, ok, I can imagine that's not pleasant.

Does stubble deter others?

Or is the vagina just ugly to some? He's as straight, heterosexual as they make them. He's a boob-man, maybe some people just find the close-up contact with a vagina unappealing?

The "talk" has been had. He is vague on this subject. We've never had any event or gross "thing" happen when he's given me oral, so I don't know if there's a mental block against it for sanitary reasons. Any time we've had the "talk", he gets very distant and says I keep pressuring him. I've read many LL's here mention the pressure from a HL, and 1. I don't want to make him feel this way, 2. I don't want to encourage pity-sex or something he's uncomfortable with, and 3. when we have the "talk", it often results in a long dry spell. Maybe this is just who he is, even though I don't understand it. I am always too eager to do things for/to him, I feel so undesired thinking some aspect of my body, especially such an intimate aspect, is just like "meh, not interested". I'm not looking for advice, necessarily, maybe just some insight from those who have any sort of aversion to giving a woman oral.

Kinda sucks when the only reference you have has been 2 partners (and one was so brief so long ago, I hardly remember it) that you compare yourself to porn. I'm average. I don't have a weird looking hooha, I'm not overweight but not porn star quality either.

He used to watch porn when he was younger, I suspect part of his education is influenced by that, although he says he doesn't watch it now. Neither of us are anti-porn, but I know the death grip thing gets mentioned a lot. I don't believe there's a porn addiction I'm unaware of.

And then there's the looming thought of, "maybe I'm just gross and he doesn't want to tell me." (probably my biggest fear) Maybe I should just leave it alone and try to be happy with other aspects we do have. He's good at other things when he wants to be.

I dunno. I'm just waffling now. Thoughts for a confused woman?