No.Sexuality is expressed at the chromasomal level,and thus far,once dictated in the embryonic stage,is irreversible.Although androgens interact with chromatin once they're complexed with their carrier vehicles(receptors),they do not seem to interact with the nuclei in the section of the brain which modifies sexual preference.It is certainly possible to make one's appearance more 'masculine' through the addition of exogenous androgens,but this will have no bearing on sexual preference.