Probably you don’t want to do this. Generally kissing is a sexual thing. and you need to draw the line somewhere withwhat kind of same sex affection is appropriate. I don’t think affection is wrong. Actually I think categorizing affection between males as “gay”, is a contributing factor to becoming gay. I spent so much of my life deprived of same sex affection and that made it easier for me to have gay fantasies. What affection is appropriate? well obviously sexual stimulation is not appropriate affection. but outside of that, you have to judge context. In our culture kissing basically is a statement that says “this is/will be a sexual relationship”, so your sending the wrong message to yourself and others. Also you could consider it lustfull, your using another guy visually and physically for your pleasure. I would seek out help, I got therapy with the help of the book Shame and Attachement loss: The Practical Work of Reparative Therapy. No Joke, its worth having, but our politically correct culture has labeled this kind of thing as dangerous, which I very much disagree with.
Some affection,like a handshake, is obviously ok. But in other circumstances, cuddling and the like, are questionable.
I would say that as you are starting out, excercise more caution, because you don’t know if you are doing something for sexual reasons or not, but If you get to a place where you have had significant healing from SSA’s, you can loosen your precautions a little bit. The important thing about non sexual affection with another man is you both need to be comfortable with it. If it’s just you who wants it, and the other guy is a bit uncomfortable, then you are using him.
And it’s better to be affectionate with straight guys then gay guys, because with a gay guy you might both be tempted to use eachother possibly taking it further. With a straight guy, you can leave it up to him to decide where the line is, which prevents you from using him. Getting to know totally straight men on an intimate(personal) level also has the benefit of reducing sexual attraction to men.