Depends. Tongue is good, one of the fastest to heal. For penis, either ampallang, apadravya or frenum. All good for stimulating a partner. I have two of the latter kind. They feel good even when jerking off. For something that mostly stims the wearer, go with nipple or guiche. That's along the perineum.
Medical or implant-grade steel or titanium for materials. Barbells over captive bead rings. Make sure to choose the gauge and barbell length well.
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Medical or implant-grade steel or titanium for materials. Barbells over captive bead rings. Make sure to choose the gauge and barbell length well.