For Him
Cockrings and Extensions
Cockrings are great if you want to go all night long without resorting to chemical enhancement. Good cockrings are made of leather or rubber, which are firm enough to keep you hard but not so firm as to immediately cut off bloodflow. It's a simple principle, some cockrings vibrate, some have nubs for her pleasure. Don't keep it on for too long, and you'll do fine.
Extensions are great if you need that inch or couple inches and know that penis pumps don't work that well for making you bigger. (They're great at helping you get off, though). The best extensions are made of cyberskin or similar textured material, but this is unnecessary. You can also get extensions with bumps or ridges, for her pleasure, or extensions that vibrate (for both of you). Extensions can be worn for as long as you like without risk of harm.