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This does not work as a pure butt plug. It will not stay in place. It does however work for some fun anal play in the bedroom.
The Tantus Pi would be a good choice for someone looking for a small and simple anal probe. The ripple on this are pleasurable however, the curve straighten out easily making it poor for G/p-spotting and the vibrations are mostly concentrated in the base making it a mediocre vibrator (replacing the included bullet helps). While it is not going to satisfy advanced users or size king/queens the small size is good for warm-up, beginners etc.
Pi is a pretty decent anal probe, and that's about it. While it can be used vaginally, it probably won't do much for most women and it's too soft and flexible to give any kind of good stimulation to the G-spot or prostate. The neck doesn't stay in place very well either, leaving you with just the ability to thrust the bulbs in and out.
The PI is a toy that's ideal for someone new to anal play. This was my first foray into prostate stimulation and while the toy wasn't firm enough for me to achieve a prostate orgasm, the orgasm I did have was enhanced by the graduating beads on the shaft. It's a great anal toy for either him or her and will certainly be enjoyed by all.
The Pi is part of the Tantus Elements line. As with all Tantus toys, the Pi is made from 100% medical grade silicone, so you know it will last. The Pi is like graduated anal beads with a twist. The twist is that they are bent to provide stimulation to your prostate or your g-spot depending on where they are inserted. The silicone is relatively soft and since the ripples are graduated, it makes it easy to insert and means the toy is good even if you are just a beginner at anal play.