
As an empirical researcher, I've been experimenting to figure out the difference. What draws the twinks, and what repels them?
The first step in a research project is defining your terms. I defined a "cruise" as an up-and-down glance (face-crotch-face) of any duration, with the eyes slightly widened, accompanied by either a smile or a rounded mouth (a sign of surprise).
The second step is defining your subjects: who will you be experimenting on. My subjects were all guys between 18 and 29 years old (estimated age), who were sitting, standing, or walking in a position to see my face and torso.
The third step is locating your data collection sites. I gathered most data on campus, since I'm there all day and there are a lot of twinks around, but I also used the YMCA, the gay-friendly coffee house, the straight bar downtown, and the jogging trail that leads to the ski lodge.
The last step is collecting and analyzing your data, using percent differences, chi squares, t-tests, or regressions. I used percent differences: what percentage of the subjects cruised?

1. Tight short sleeved shirts. This one is a no-brainer. When I was wearing a heavy winter coat, or even a leather jacket, cruising was limited. Tight shirt, it increased by 40%. Your pecs and biceps have to be on display.
2. Scruff. I never grow a full beard; it doesn't come in properly. I let the scruff grow out for a few days, then shave. For the first three days, as the scruff grows, the cruising increases. Then it tapers off.
3. Bright colors. Since I have a fair complexion, I usually wear dark colors to avoid a "washed-out" look. My wardrobe consists mostly of black, navy blue, and dark red. But on the few occasions that I've worn my bright red or orange shirts, the cruising increases significantly.
4. A business suit. I usually dress down, but a suit and tie, with its connotations of affluence and prestige, draws the eye.

6. Baldness. Sounds weird -- isn't baldness supposed to be a sign of lack of virility? But think of all the bald hunks on tv and in the movies -- Omar Shariff, Jean-Luc Picard. I am almost entirely bald on top -- there's just some scruff and stray hairs up there. When I let them grow out, cruising goes down. Shave them off -- pay dirt!
7. Morning. The cruising rate is much higher in the morning, when the twinks are just waking up, than later in the day. I don't know why.
8. A Smile. In gay bars, the standard cruising pose is a frown: you represent a passion that is dark, mysterious, and dangerous, not lighthearted and frivolous. But in the straight world, cruising is all about accessibility, and a smile makes you more accessible.
The full list, with nude photos, is on Tales of West Hollywood