Searching for the top-rated free web games tagged "lewd" on itch.io reveals a variety of genres ranging from lighthearted parodies to experimental narratives. 

Several titles consistently top the itch.io ratings for their combination of art style and gameplay mechanics: Nagging Nadeshiko : A high-speed anime clicker

So, if you're looking to explore a new genre or simply find some free games to play, be sure to check out the top lewd games on itch.io. You might just discover your new favorite game.

3. Hardcoded (Free Demo – WebGL)

• Genre: 3D visual novel / Dating sim
• Developer: Furai
• Why it’s great: Fully 3D, voice-acted (partial), and surprisingly wholesome despite being lewd. Play as a fembot repairing yourself while romancing quirky characters.
• Playtime: ~1 hour for the demo.
• Lewd focus: Trans/fembot themes, consensual, animated 3D scenes.

3. Flip Flight

Developer: Cured Pink Genre: Arcade / Skill