My wife of 10 years constantly invites her ex lovers, ex boyfriends, ex husband over for family gatherings..?

I understand inviting the ex husband with his wife for special occasions since my wife and her ex do share a daughter together who is now 24 and with her own child. What i don't understand is inviting her ex lover with his wife and kids, her random ex boyfriends with their girlfriends...they are all nice people and all...but I really do not feel comfortable sitting at a table full of people who f***** my wife. Am I being unreasonable? she IS a very charismatic and beautiful woman but sometimes I feel like she doesn't understand me. I told her how I feel about this and she just says, "Michael, please you're giving me a headache" Please somebody offer me advice on how to approach this another way? ps...we were also on holiday all together (she invited all of them with my money by the way!) and her ex lover was hugging my wfe from behind (his wife was present) and saying, "you know how much i love you" i understand this is all innocent and she likes being this mother teresa and 'leader" of the pack...but frankly I'm getting sick of it.