While Steam has strict rules, they do host "unrated" or adult-themed strategy games. You may need to adjust your account's "Store Preferences" to see adult content. Essential Safety Tips for Downloads

Always run any downloaded .exe or .zip file through an antivirus program or a service like VirusTotal before opening it.

If you prefer not to install software on your computer, many adult chess games are available as . These allow you to play directly in your web browser without needing to download any files, significantly reducing the risk of malware.