Good point JK, here's the original thread...but basically an agency trying to stop bad guys from altering the past to reshape the future with everybody bouncing back and forth from the past to the current time.
Reminds me of a show from my youth. A genius dog named Mr. Peabody has a time machine. He and his pet boy Sherman travel back in time to meet famous historical figures and discuss the meaning of life with them. Generally no sex was involved, though. Also, there was a time-travelling turtle, but that was only peripherally related.
"Time Tunnel" where two guys went through a portal similar to the StarGate shows to visit other time periods
"Voyagers" was fun because there was a kid that traveled with the adult as they tried to fix or stop major problems in the past.
The one I liked the best was "Quantum Leap" where the main character not only traveled in time but jumped into the body of someone/thing having problems that needed help.
There was also "Early Edition" which was a twist on the time travel theme, where the main character got tomorrow's newspaper every morning and had to prevent a tragedy from happening each day.