It's pretty hard to parody Species. It would basically be taking a softcore porn film and making it hardcore.
I've just this second decided I want to make a porn parody of the 80s Transformers film. Put them in garish coloured outfits with chunky plastic bits to make the look faintly like their robot counterparts. Sadly there was only one female Transformer in it, Arcee, and I think I'd doll Kagney Linn Karter up in bright pink and give her a pink Princess Leia haircut wig for the role. Actually I'd take some liberties to make sure it wasn't just Kagney doing all the work.
Scene 1 : Arcee (Kagney Linn Karter) and Hot Rod (Keiran Lee) having some fun in the woods outside Autobot City. Isn't life great? They fuck.
Scene 2 : After a battle with the Decepticons, Optimus Prime (Johnny Sins) is dying. Arcee (Kagney Linn Karter) wonders if one last fuck might save him.
Scene 3 : Hot Rod (Keiran Lee) and Kup (Erik Everhard) are taken prisoner by the Quimtessons, a race of lesbian robots that put them on trial for being male. They think male robots are worthless and incapable of satisfying their needs. The magistrate (Kortney Kane) and prosecuter (Jessica Jaymes) need convincing, so Hot Rod and Kup fuck their way out of trouble.
Scene 4 : After being transformed by the Matrix and saving the day, Rodimus Prime (Keiran Lee) walks in on Arcee (Kagney Linn Karter) sucking off Ultra Magnus (Mick Blue). "Hey, he isn't leader any more!" protests Rodimus. "Aw come on, the whole time I had the Matrix I didn't get to fuck her once!!" says Magnus. Arcee quickly diffuses the situation by happily fucking them both at once. At the conclusion, seeing the fun they've had, the disembodied voice of Optimus Prime promises to return from the grave, because he isn't finished with Arcee's tight pink robot snatch yet. I'd especially look forward to KLK looking up at the sky listening intently in open-mouthed shock, with the jizz still running down her face.
Probably seems like a lot of Keiran, but is Hot Rod's story after all.