I don't know if "subliminal" is a real thing or just a layperson idea, but when I talk about media in intro I show some images to show just how carefully advertisers are steeping their material in raw sex. I start with the image below.
I ask: Notice anything interesting about this image? Even in very large classes it usually takes a long time for anyone to see...
...that the shadow of the liquor bottle is pointing directly between her nearly bare breasts.
Then I show them these:
NEW: That's Salma Hayak and Campari... or should I say Salma Hayak's boobs and an ejaculation fantasy.

And where is the rocket going?

This is from a gay mag.

What image accompanies the word "come"?

I love this one. Eh em.

I also think Gwen's post here is great ("testees" anyone?)
And I close with a visit to the Gillette Vibrance website. The Gillette Vibrace razor may or may not be a razor, but it's definitely a vibrator.

1. Go to the
website.
2. Watch the umbrella penetrate the v (v is for vulva) shaped lines on the screen.
3. Click on Go to Venus Vibrance (there are a number of razors on this site).
4. Note the shape of the product.
5. Look at where the model's hand is.
6. Click on the message-in-a-bottle for a "GoddessTip." Notice how it spurts out.
7. Click "Learn More."
8. Click through the information bytes.
a. The second one shows the vibration. “Push of a button,” eh? “A whole new shaving experience”? I bet.
Students love this.