Hi,
Paid version and public are almost the same when it comes to available content, whenever dev adds some new events, those are in the paid build for patrons first, so they can see them earlier, but eventually it'll be available in public build as well - only later.
As for the mouth and dick interaxtions - those upgrades are related to the DEX level and can be unlocked via in-game shop, the same place where you buy consumables and other upgrades.
Check out our wiki page about Upgrades, look for "thermostat" and 2 rows above it, you'll find the upgrades for mouth and dick.
Cheers