I'm not sure if pornography is really that bad altogether, if er..."used" wisely. After all, it's been around since the dawn of civilisation, in one form or another.
But I completely agree that adult content in SL is a positive thing, for all the reasons you mentioned, and perhaps many more. Whether it's about pushing our boundaries in a safe environment, enjoying some rather exciting time with complete strangers and parting ways afterwards, or forming long-term close relationships, the adult aspect of SL can be a place to celebrate, discover and become more accepting of various aspects of our own - and other's sexuality.
I'll pass on sharing my own experiences though. I'm really innocent. All the naughty photos on my flickr are completely staged and I'm basically an angel XDDDD