A sex act in which a person (male or futanari) rubs their penis in the cleavage between their partner's breasts. Also known as titty fucking or mammary intercourse. On Danbooru the Japanese term 'paizuri' (ぱいずり) is used.
If the penis is long enough, fellatio may also be involved at the same time.
- multiple paizuri (for two or more people performing paizuri on the same penis)
- perpendicular paizuri
- breast squeeze
- naizuri (flat-chested paizuri)
- paizuri under clothes
- paizuri over clothes