If you're talking about someone who sleeps around a lot then:
For guys - Players
For girls - Skanks or sluts
For general dating, I'm not sure there's any particular name for it - maybe they're people who just lose interest quickly, so they keep changing partners.
Chat with our AI personalities
You would call a person who praises himself a lot a narcissist.
A person who watches movies might be referred to as a viewer. Also I have heard people call them a movie buff, which means they know a lot of stuff about movies.
Film buff ,cinimafile.
Without wishing to sound flippant, a lot of people died in 1989. Can you be specific about what sort of person you mean?
A person who exchanges information online with others he or she plays video games with~Apex