Sure, the Ovipositor may not be everyone’s kinky cup of tea, but that goes for any sexual fetish. If you are tempted to try it, you can ease your way into it with different-sized accessories and egg molds.
OK ... but is any of this stuff body safe? Well, that depends. Any kind of anal play is typically riskier than inserting stuff into the vagina, and you may not want to risk losing a gelatin egg in your butt. But as long as you're using plain gelatin (adding sugar to the vagina can lead to nasty infections), these eggs are designed to dissolve with body heat. Even so, because there doesn’t seem to be too much research on the specific hazards involved with using the Ovipositor vaginally, you should lay alien eggs at your own risk.
If you want to avoid gelatin eggs altogether, there are some alternatives like silicone body-safe eggs, according to this Reddit thread. However, LoneWolf cautions against these, saying they don't tend to play well with the Ovipositor (they get stuck). Plus, because they won't dissolve and have no way of being retrieved, they are a definite no-no for anal play.
And if you want to feed your curiosity while you weigh the risks of trying the Ovipositor for yourself, or if you want to limit your fetish to more earthly creatures, there are tons of online videos of the tool in action. Maybe start with this one first. You can always dive into egg-laying porn videos later, if you do decide to take the plunge.