No it does not make you a bad person. I just think it is harder for some people to not become attached and want more out of friends with benefits. Usually in the end , this ends up leaving one person with a broken heart because over time they realzied they want more than the other person. Just be sure that this is what you really want, It can be hard. Also it is a little riskier, because of the chance of becoming pregnant. Because if you aren't in a realtionship with the person now, imagine how hard it would be if you were having a baby together. There is always a chance for mistakes