But not with me

My wife is very permissive and I am 100% happy with my ** life.My wife (my 2nd wife) is much younger (35) than me and I always suspected she was not 100% satisfied with my bed skills. But she never complained ever.

Now where we vacation (Ibiza) there are plenty of opportunities. I always suggested to my wife we tried things but she always refused. No hard words, she just said she would not like that. But last winter she agreed. Kind of. She said we can "try that, once".
We booked into one of the parties and before we danced twice there was a handsome guy clearly interested in my wife. I danced with a young exchange student, very drunk, and at the end of the party it was clear I could do anything with her despite the huge age gap (me 53, her 18). She was just so very drunk and loaded with party pills.
We all ended up in that guy's room and as soon as the door was closed he started to undress my wife. Then he tossed her on his bed and he started to --- her.
There was no other bed there and I slumped in a big armchair with the young girl in my lap. We kissed and then she went down and started to give me oral. I leaned back and as the girl did what she liked I watched my wife and her guy.
My wife's date was an energetic lover and he went into her from behind while pinning her to the bed and grabbing her ** in a way that showed his preference for strong play. My wife gave in to him and I cannot say if she enjoyed that or not. To me it was kind of asexual experience - watching them.
The young girl stopped licking me and started to undress but I did not want to have ** with her so I gust grabbed her when she was naked and pushed my fingers inside her trying to please her. But I think she was to drunk. So it was OK but not as great as I imagined things could get with a very young girl.
I kind of waited for it all to end now when I heard my wife shout and then saw her bent on the bed and shaking. I thought she got hurt by her guy but when I looked I knew it was not from pain but rather from pleasure. She convulsed and when that stopped she was there on the bed completely lifeless.
Back in our hotel I asked my wife about that and she told me the guy, possibly by mistake and in haste, pushed into her ** and went on for a time before he finished there. She "lost her mind" as he did that. She said.
The point is she never gets ** like that with me. We never have ** ** either. I am not into it.
So my question is should I break myself thru and start to take my wife anally?