man i remember that episode of Voyager where they rescued that old ship of Klingons and one of them had a thing for ensin Kim cuz he was assertive at one point, good thing Nelix saved him and got some action for himself XD
On line? No. You can see the TOS ones on YouTube on CBS channel. As for the other shows, I don't know on line. Copyrights are to strong. The ST:TNG is on BBC channel and SciFi Channel. I have no idea about DS9, Voyager or ENTERPRISE. Sorry.