I think that there would be an issue with this. General rule of thumb, unless you built it from scratch or it came from a merchant resource and you modfied it enough to satisfy the EULA then keep it for your self.

If he has poser and the original character I think you may be able to export it as a morph target and then he can use it on his copy of the character (including exporting it to 3ds) but unless he owns a copy of the original obj I'd stay clear.