One of the worst movies =)

[StasSHV]

Can anyone remember what was the title of the movie, where a group of scientists somehow open a portal to a dimension with huge eye aliens, and then one alien crawls through this portal and starts raping with his tentacles everybody???

[Psycho Circus]

This could be "From Beyond" (1986) that you are trying to describe.

http://www.imdb.com/title/tt0091083/

A scientist is working on a device that opens another dimenson, which stimulates the pineal gland. He gets eaten by a monster and then returns in a constantly mutating form to attack some other scientists. The pineal gland, when it's coming out of the head does look like an eye on a stem.

http://www.youtube.com/watch?v=XNUoalLngEA

[Vane]

it does sound a little like from beyond.

[retrorussell]

Or maybe The Killer Eye.

[badmovie]

This is just a very wild guess, but it could be this:

"Contamination" (1970)

For more information about it, look it up on the IMDB or all-movie guide.

Once again, I do not know if it is what you are looking for, but it easily could be. It does sound a lot like your description. Anyway, I hope this helps, provide more info if you can think of any.

- Basketcase

[Andrew]

This is just a very wild guess, but it could be this:

"Contamination" (1970)

For more information about it, look it up on the IMDB or all-movie guide.

Once again, I do not know if it is what you are looking for, but it easily could be. It does sound a lot like your description. Anyway, I hope this helps, provide more info if you can think of any.

- Basketcase

I could not locate a 1970 movie named "Contamination."  The one I think you mean is the 1980 film.  There is an alien in that with a big eye, but nothing else matches.  It does not come through a portal and no tentacle rape happens.  What most people remember about "Contamination" (1980) is the alien avocado egg things that make people explode.

[Nukie 2]

I think it's the Killer Eye too.

[Joe the Destroyer]

Killer Eye trailer, in case you needed one.

http://www.youtube.com/watch?v=mXOvU5kajr0