To provide a sex aid to be safely used by a user without having pain as an aid for the correction of a phimosis penis and erection maintenance power.

The sex aid 10 includes: a cylindrical elastic body 11; and a plurality of ring shape elastic bodies 12-15 mounted on the outer peripheral surface of the cylindrical elastic body 11. The ring shape elastic bodies 12-15 are made of a raw material to be hardly expansible compared with the cylindrical elastic body 11. The ring shape elastic body 12 mounted close to one end of the cylindrical elastic body 11 among the ring shape elastic bodies 12-15 has a perfect ring shape without a missing part. The remaining ring shape elastic bodies 13-15 have imperfect ring shapes, each of which has the missing part at least at one place in the middle of the ring.