I've seen both moral and immoral techniques used imho.

I have also seen the same technique used in ethical and unethical ways.

I think its harsh on anyone to say that doing peer on peer evangelism with youth is 'flirty fishing'.

Teenagers flirt its the nature of teenagers, to blame the youth pastor I think maybe a little harsh.

However if the youth pastor is pro-activley sending pretty girls/boys to contact members of the opposite sex you may have a case.