Sore anus after penetration?

[virtualflowe]

First time I was fucked, her cock was long-ish and average girth.

It felt good for a while then I started feeling nauseous.

Turns out that she had pumped so much air into me, it made me feel like throwing up.

No problems the second time (with a different girl).

I've had a sore anus from using large toys but that usually lasts only a day. It is usually caused by impatience - wanting to push something in before my ring was ready.