I have two current favorites. One is grapeseed oil. It's slippery, never gets sticky or goopy, and it is full of vitamin E. Good for her skin, your fingers, the skin on your penis, etc. The one thing it's bad for is condoms. It will weaken latex, which can lead to breakage. Also, it usually comes in a glass bottle. Besides the obvious, like not knocking it onto the floor and breaking it, also don't make the mistake I did and keep a little on hand near the bed in a plastic bottle. Seems like it started eating the plastic, leeching chemicals into the oil and after a while my girlfriend started complaining that it burned. We stopped using that bottle and voila! no more burning sensation.
The other, which has essentially supplanted even grapeseed oil, is a commercially available product called Aloe Cadabra. It's 95% pure, organic aloe vera and is available from the manufacturer's site or at health food stores (e.g. Whole Foods markets). It's wonderfully slippery, viscous enough to stay in place, doesn't dry up or get sticky, and it's also wonderful for your skin and inside her vulva. Aloe Cadabra, unlike grapeseed oil, is also completely condom-safe. A little bit goes a long way.
Put just a little on your fingers and liberally rub it around the outer lips, the glans of her clit and some inside. It will feel good and help warm her up and get the blood flowing into all the soft, sexy, wonderful tissues and make your time together more comfortable, whether tender or rough or anywhere in between, and she'll be wanting more!
