"Deathtrap" was an endevor that I think both he, and his fans. would rather forget.
That kiss in Deathtrap between Reeve and Cain was important. Remember, it was 1982. Life in this country, for gay men, wasn't that great. In fact, it was pretty bad. Maybe not as bad as it was in the 40's or 50's, but there was still a tremendous amount of explicit hatred for gay people. Ronald Reagan had been inaugurated just a year before and he was professionally anti-gay. As a movie, it may not have been a blockbuster. But for the time, it was important.