Selecting your ideal strap on dildo involves considering both the harness style and dildo specifications. Adjustable harnesses with multiple straps offer maximum security and fit various body types, while underwear-style harnesses provide comfort and aesthetic appeal. O-ring harnesses allow you to swap different-sized dildos, offering versatility as you explore. For the attachment, beginners should start with smaller realistic dildos or smooth silicone dildos around 5-6 inches. More experienced users might enjoy larger sizes, curved G-spot dildos, or textured options. Look for body-safe materials like platinum silicone, and consider features like suction cup bases for hands-free play. Vibrating strap on kits add extra stimulation for both partners, while hollow strap ons offer solutions for erectile challenges.