You have not given ages. At certain points in life, the sex drive seems to dry up and then return. Menopause, health problems, emotional stress due to problems in family, death of a fmaily member. All kinds of things that are not permanent sometimes derail the sexual activities of a committed couple. Check to see if any of the above, and these are just examples, are true. If so that could give major insight into the situation.
Has your wife had a complete physical? Does she work one or two jobs, be the family maid, another full time job, and scout leader, youth leader, etc for children.
About the children, are there any? By instinct, a mother is going to take care of her young which I would assume in humans to be children about 10-12 and younger. That will take precedent over having sex with a mate.
When you receive pleasure from oral sex, is your first goal pleasuring her or yourself? If your wife gets the impression that the sole reason you are doing anything sexually is only for yourself, it will be a turn off for her. That impression doesn't have to be true. It may be as wrong as hell, but if there is that doubt....it can affect your relationship.
No one has mentioned it, but, masturbation has been a man's friend now as long as their have been men. If you are horny and don't want to involve someone other than your wife in a sexual affair, jack off. Masturbation never hurt anyone unless they were doing it too soon before trying to have sex with another person. (Most guys can only shoot their wad so many times and have a period of recovery that has to be kept in mind.) I would be discreet about masturbation, but if you get caught, just explain you were getting the edge of to make sure your eyes didn't wander in public.
While I do think your wife used poor judgment in the timing of telling you this piece of news, do consider that this trip to Las Vagas may have been only YOUR trip. She may have never been into the trip from the get go. Again, I am not taking the wife's side her. She may have been more interested in stirring a little romance that night, but she didn't. To say whose fault that was is beyond me with the knowledge I have.
Last suggestion is hard. Try to take care of her needs first. Make it all about her. In the perfect straight relationship, for the man it is all about
her and for the woman it is all about him. If both partners take that attitude then there will be some hot passion coming from somewhere.
BTW, you don't have to go all the way to Vagas. Sometimes a little cheap cabin or nice motel room in a different city is all that is needed. Thousands of dollars aren't always needed.
Good luck. At ten years this is not unusual at all. It usually happens after five years but before 15 years have gone by. The initial passion is gone, now a real marriage must be truly formed.