I tend to see sexuality as a complex set of continuums influenced by equally complex forces rather than a rigid set of neat little unmalleable boxes people just happen to fit into due to biology. I myself have a history of all hetero relationships, and have fathered a child and despite difficulties with sex due to abuse have sometimes enjoyed it under the right circumstances although my shyness has made it hard to initiate relationships. However I do also find some men very attractive (although I have not had sexual experience with men) and because of that tend to describe myself as somewhat pansexual and fluid so I do think it is entirely possible for other people to be like me, capable of being occasionally attracted by the same sex even if not acting on it.