Sorry Tambajam, but somehow it is 'who lives like that'. I don't, and I don't know anyone that does live like that either...
Friends invited to weddings are one thing, but surely they don't have to be people you've slept with... unless I missed some memo or something. .
There certainly were not any people at my wedding that either my DH or myself had shagged previously, there were no ex girlfriends/boyfriends.
IMHO it would not be appropriate, nor desirable.
OP is perfectly entitled to her opinion, she's not comfortable inviting her ExH, despite having a DD and still maintaining a good relationship with him. She is also not comfortable having her fiance's Ex there either. Perfectly understandable.
As I said, maybe OP IS being a little unreasonable, but sometimes we are all a little unreasonable about some things. This is her wedding, she's hardly being a bridezilla in asking that exes are not a part of the wedding. I did suggest as a middle ground that perhaps OP could have the ex to the evening thing, and not at the church.
We're all entitled to a past, but no need to include the past into the future.