Could Nolvadex or Clomid be used as a performance enhancing drug?

I understand that these drugs are used for post cycle therapy but would using them alone, without first having done a cycle of steroids, enhance strenght, muscle gains, testosterone, or lower estrogen thus resulting in gains? I am just wondering. I don't use steroids (I am not against them and I wonder why it is ok for women to use steroids for birth control/menopause but it is criminalized for men) but I just think the whole thing is very interesting. Any informative answers would be great!