Vaginal sensitivity...?

No, but you can get used and accustomed to a particular feeling. That's how it goes with everything right? When he see a movie for a first time, and you declare it your favorite movie ever....well if you start watching that same movie every single day, eventually it won't seems so great anymore.

Sex is sort of like that.....though it almost always feels awesome....it takes a lot more time to get bored of it at least. Haha. Also, if your spouse is unable to stimulate you the same way you're used to feeling, your expectations might get let down. It's not your body that has changed.

Depends on how vigorously she masturbates and for how long, some girls will climax with barely any stimulation (lucky bitches). You can decrease sensitivity doing it too much with a vibrator though. It's too much stimulation on your nerves if done excessively.

Your vagina has probably stretched out a might... There is this lotion you rub on you g-spot, it gets all tingly and warm, enhances sensitivity. You can find it pretty much any where.

Nope :):):)