Help.......All

Not attracted to cock at all. One of my wife's fantasy is for me to guide a man's cock into her, then we both have to f£$% her. It was while having a conversation with another couple, the wife, wanted her husband to suck my cock. Prior to that I never thought about it. I then started to think what if, a guy done that to me, how would i react? I hinted at her but she appeared to be disgusted at me, even mentioning it to her. It was then i thought, if it did happen would i be bi-sexual. To be honest, It would'nt bother me if it did happen. I know for sure, a few years ago i would not have harboured these thoughts.... Hence me asking the question.