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- some vibrations
- Some have texture, ridges or nodules for added stimulation
- some are smooth
- Some may stimulate your partner's G-spot or clitoris during sex
- Some have sturdier materials allowing for tighter penetration
- Some are soft and elastic
- Some have open endings
- Some have a closed end
- Some are just a stiff rod with two testicle rings
- Some have larger circumferences
- some are longer
- Some have larger girth and length