Lack of Judgement
1) Keep your pants on. Making yourself vulnerable at the deepest emotional and physical level is not something you just do for fun. Parents, its rather important that you teach your kids this, despite everything shown on TV, in films and broadcast on the radio and probably taught in schools. Stop living by your feelings alone and use some reasoning. Has your partner made a public statement of commitment to you alone, for life? If not, assume they will leave you. Has your partner had sexual relationships which ended badly? Why do you think you'll be any different? Feelings? We know those come and go. Love is a principled commitment to seek someone-else's best interest before your own. Until you have evidence your partner loves you and can control themselves, don't put yourself in jeopardy.
It seems a lot of effort is being put into trying to undo the consequences of living as if there are no consequences. It's a lie. There are always consequences. The right to be forgotten is a King Canute scenario. Your modesty is your responsibility, not the law's and it relates also to your choices before the photo's were taken. That's what the lock on the bedroom door is for.
2) No photos. There's no such thing as "private art." It's porn and it features you. If it won't be shown, you don't need it taken.
3) Social media. You risked pic's not just on paper, not just on your own hackable computer but out on the internet? (see title)
Yes its wrong to harass people like this, but there is usually an easy way to prevent it happening in the first place. Sadly, as a society, we seem determined to see the consequences as the problem and stubbornly refuse to acknowledge the real problem is with our own lack of judgement.