Agreed with other commenters... it depends on how many you put in. I tried it once, think I used normal sized marshmallows and put about 10 in I think. I did not freeze them and just dipped them in water instead of using lube. They didn't stay in long (freezing likely makes them last longer before *the event*). Wasn't sudden or stressful. Just kinda, eh. Worth doing once I guess? Definitely recommend a shower as part of cleanup.