Have I made the right decision?

You haven''t mentioned anything about how your ex has reacted to all of this... that''s probably quite important.

I dont suppose he wants the daughters finding these pictures any more than you do.
Honestly you are over reacting because he''s got a girlfriend 18 years younger.
Your kids will already have seen far worse than this on the Internet.Even if you have child protection at home on mates mobiles etc.no woman likes being traded in for a younger model.
You won''t like that answer but it''s a fair assessment of why you are over reacting so much.
All the best
Pete

No I don''t think you have done the right thing but I think this is just the result of your own mixed feelings about what your ex might be getting up to. An emotional over reaction.
Firstly, it was his laptop, this was not publicly available and he did not direct the kids to it. They went through his laptop and found it.
Secondly, you have no right to interfere in the kids contact with their dad and insist on being present at contact. This is patronising to dad, who is an equal parent, and will just inflame the situation. Hard as it is to come to terms with, their relationship with their dad is completely separate to you and no longer has anything to do with you.
Lastly, it seems to be you who has the problem, not the girls. They aren''t bothered, that''s the main thing. And at 17 the eldest is almost an adult. In fact, both are old enough to see dad on their own terms. I also think your kids behaved rather badly in emailing this to you, they should have known that you would not wish to see this. They are certainly old enough to have realised the trouble they were causing.

That''s another issue, I dont understand why he he has not challenged my decision at all! Just accepted it.

Thanks Pete. It has been a kick in the stomach after 20 years being married. But he is their dad and shouldn''t have let this happen x