The Hook-Up Game
An honest look at the odds. Make some choices, see your real-world chance of an STI this year — then roll the dice.
Educational model for ages 18–35. Not medical advice.
What's your anatomy?
This shapes how easily infections transmit to you. We keep it clinical.
Your partners have…
Pick “both” if you're bi or pan — we'll use the higher-risk pairing.
Who are you hooking up with?
Pick the type of partner you'll have this year — then choose how many.
Do you use condoms?
One setting for all partners. It matters a lot for some STIs — and barely at all for others.
Have you had the HPV vaccine?
HPV is the most common STI by far. The vaccine prevents most high-risk strains — it's the biggest lever on your odds.
Your odds of an STI this year
See the full breakdown
Rolling the dice…
Tweak your choices, then roll the dice again
This is an educational model using simplified, population-level estimates calibrated to CDC/NHANES data. It cannot predict any real individual's risk and is not medical advice. Real risk depends on testing, treatment, local prevalence, vaccination (e.g. HPV), and many factors not modeled here.