1) All of us who have YFs need to be aware of the danger that our YF will make a serious pass at us, and need to have thought about how we will react if such an event happens. It's also worth thinking about how you can put up implicit barriers against such an event; for those of us who think gay sex is wrong before God, we can probably make comments referring to that in a way that makes clear that we don't want that to happen.

2) There's legitimate touch and illegitimate; with any boy it's perfectly OK to have whatever touch he's happy with that isn't sexual in your mind - thus hugs or running your hand through his hair or cuddling up on the sofa may be perfectly safe and right. The question is 'what is going on in your head?'. To the extent this is foreplay leading towards sexual activity, to that extent it's a mistake; to the extent that it's no more than what he does with family, it's probably OK, though that may be a useful test - if he tells his parents what you were doing with him, would they be concerned? The danger is that we non-verbally communicate more than we realise, ultimately encouraging him to make an offer we really don't want to hear. On the other hand one of the problems of much of the US and the UK is that our culture discourages healthy touch, so that those of us not in 'relationships' find ourselves starved of something that we do need, with the result that we are inclined to look for more from our YFs than is really appropriate.

But yes, there is a danger that things will go wrong. However the belief that we must always act in the most risk averse way is wrong headed - as elegantly argued in this article

http://www.timesonline.co.uk/tol/comment/columnists/guest_contributors/article7116140.ece

"David Cameron’s plans mean children will die.And that is a good thing. Young people must confront danger."

To refuse to have a YF is depriving both of you of the opportunity to grow closer to God because you have learnt about God from each other in a way that noone else can show you. Yes there's a risk - but also the prospect of a great gain.