Why'd she dry out?

Humans are mostly made of water, and vaginal fluid is most certainly water-based. This means it can evaporate under normal earth conditions. This is normal. More normal than that is the fact that even when woman are sexually aroused, they may not make enough vaginal lubrication to make prolonged sexual⁠ (sexual: About or relating in some way to sex or sexuality.) intercourse⁠ (intercourse: When people interlock their genitals and move together as feels good to them for the purpose of sexual stimulation and/or reproduction.) comfortable. Thankfully human ingenuity has given us the invention of personal lubricant⁠ (lubricant: A fluid used in order to make kinds of sex (such as masturbation, vaginal intercourse, anal intercourse or manual sex) more pleasant and comfortable, and/or to help prevent condoms from breaking by decreasing friction.) . Applying a good water-based lube like Astroglide or KY can alleviate the dryness and make sex⁠ (sex: Different things people choose to do to actively express or enact sexuality and sexual feelings; often this involves genitals, but not always. ) a lot more comfortable for both of you. Moreover using additional lube can reduce the risk of condom⁠ (condom: A thin sheath or tube of latex or another material, worn over the penis during sex to prevent or reduce the risk of pregnancy and/or sexually transmitted infections.)  rupture.

So it’s a good idea for you and your partner⁠ (partner: In a sexual context, a person with whom someone is having some kind of sex. The term “partner” can be used for all kinds of relationships, not just serious ones. “Partner” can also mean the person someone is with in a romantic or familial partnership.) to always use a latex condom with water-based lube, even if that condom was lubricated in its packet.

More info on condom use can be found in our article Condom Basics: A User’s Manual