Could be..
His work is great though... a little too sexual at times. Why do surrealists like him and Salvador Dali have an obsession with sexual content? Strange....
I wouldnt limit this to the surealist movement, I would just say its an artist, creative thing.
Judging the first Alien movie by itself, its completely riddled with sexual iconagraphy. For instance: A phallic squid looking face-hugger.. Look at an image of one, it literally has testicular sacs on each side of a long proboscus ( spelling). It's sole purpose is to rape.
Now this idea has nothing to do with the other Alien movies, which had very little to do with the first movie, whatsoever. The second movie and the ones that followed were more of a spin-off to the movie Rambo then a sequal to the Alien.
Basically what the first Alien movie did was take the old horror movie monsters and read between the lines. King Kong grabbed a human female for what? The creature of the black lagoon stole a lady, why? In another case the wolfman stole the lady, why? Dracula has his clutches on the lady.. to do what? What was he gonna do to her?
Alien spelled it out in big red letters, that giant monster with the phalllic looking head? and all those dildos on its back? Its going to rape you. The damsel in distress? You, me, anyone, the Alien isnt picky.