@ThejoyofNC are we reading the same thread? Most of the replys to the OP have said that she shouldn't be forcing, or persuading, her partner to give her oral sex if it is something he dislikes doing! So I am rather bewildered at your shock?!
@cookingaroast the main concern that I can see here, is that over all those years, you and he have not already discussed it, and at least 50% of that responsibility surely has to lie with your partner. If he dislikes "going down on you" then he should have told you that the first time you asked him to reciprocate, and not just agreed that yes he would do it, but then never, or at least rarely, actually doing so.
If he does actually dislike giving you (presumably any woman) oral sex - which appears to be the case, unless he is just very selfish and lazy - then he should have told you that, and explained the reason why. If we knew that we - my husband and I - were going to have sex, we would always have either a shower, or a very good wash of our genital areas beforehand, after having done any necessary pees of course 🙈
Of course, sometimes making love happens more spontaneously, in which case we would probably not include oral sex, as unwashed genitals - when up close and personal - are not that much of a turn on 🤢. If a partner insists that he doesn't mind, or hopefully even enjoys, giving oral, then in my experience, them giving you oral first is usually better, as once they have "cum" they usually prefer to have a little nap, rather than pleasuring their partner; although, to be "fair" (to whom?!) the 'napping' often doesn't seem to happen anyway, until that is, they are in a long-term, established, relationship!
I'm really sorry OP that such an intimate and generous part of love-making, especially for those that enjoy both giving and receiving oral as much as we do, is such a stumbling block in your relationship. Please do have 'the' conversation with him, and at the best time you can choose, but preferably not just either side of making love. Try to stay calm and not sound accusatory during your conversation, hear him out properly, and preferably with some forethought about some of the different answers he may give, and if he does say something like he hates giving oral every single time he does it, is there something else he could do that would give you equal, or almost equal, pleasure?
Good luck OP! 💐