Mal- your views are utterly extreme and the more you post- which you continue to do so with vigour- the more apparent that is.
You would do well to advise your DD about safe sex and the fact that not all STIs are prevented by condoms. You would also be advised to warn her that for some people too much casual sex can erode self-esteem. And that men usually are able to be emotionally detached about sex.
As for being "faithful" to your DH if he dies first, how on earth would you know how you would feel then?
If I were to die young, I would wholeheartedly hope my DH would find someone else rather than live a celibate life. and he would want the same for me. That is what love is- not the possessive sort that you seem to have.
If you don't mind me saying so, your views are not just unusual, they are "brittle" and unbending. That is not a virtue- it is a fault.
As for having had a hard life before you were 16, well, hadn't we all- but that can mean we develop in one of two ways; with compassion a nd understanding, or uptight, harsh ,judgemental and bigoted. You sound as if you could do with therapy to be honest.