I don't remember either the title or the names of the actors. This movie is a comedy and I would estimate that it was made in the 90s. There was some very funny and memorable scenes though: one which there were three guys in a bed having sex with 2 girls with the lights off but when the lights come on there's a bulldog licking the nuts of one redhead actor. And another scene where a black actor tries to teach his friends about tantric sex and he says he hasn't ejaculated in 6 months or smt and the other guys were like: I haven't jacked off in 6 minutes! Hope I could get a title for this movie

Can't remember specifically which movie, but:

This one has Tantra in it...
American Pie 2 (2001) (http://www.imdb.com/title/tt0252866/)

And these ones have a bulldog in it that gets used in a lot of pranks...
Van Wilder (2002) (http://www.imdb.com/title/tt0283111/)
Van Wilder 2: The Rise of Taj (2006) (http://www.imdb.com/title/tt0480271/)
Van Wilder: Freshman Year (2009) (V) (http://www.imdb.com/title/tt1276434/)