Sex toy for men. The Pink Lady STU (Stamina Training Unit) Fleshlight includes a Gold Fleshlight Case with the unique STU Sensation Pink Lady (vagina) orifice. Perfect for customers already experienced with the Fleshlight that are interested in trying something new or that require a tighter sleeve. Marketed as a viable method for improving sexual performance due to the heavily textured and stimulating sleeve.The key to lasting longer in bed and becoming the lover your partner desires is practice. The STU (Stamina Trianing Unit) by Fleshlight by fleshlight was designed to replicate the incredible sensation of sexual intercourse. Using the Stamina Training Unit can help with premature ejaculation and permormance anxiety.