Spectra-Gels® Anal Plug. Doc Johnson's Anal Plug is a must-have for both men and women. Designed to target both prostate and g-spot, the smooth shaft angles for easy insertion. Its flexible body gives you full access to reach erogenous zones while the flared base ensures the toy will stay in place. Made from non-phthalate body safe material, which includes Doc's antibacterial Sil-A-Gel formula.