I don't think I've ever seen anybody ask a question like this before. Anyways, many such experiments don't have such an effect on animals from what I understand, so I think I'd lean more towards "yes he probably still can". Unless of course it's mentioned somewhere that Jenova cells and Mako energy are highly radioactive? It's been a long time since I've played this game, so I don't remember. Radioactive substances carry a high risk of making individuals sterile, don't they? [Feel free to correct me if I'm wrong here]