Tiger's Alleged Mistress -- Graphic Texts

The text messages one of Tiger Woods' alleged mistresses allegedly received from the golfer are extremely graphic, TMZ has learned.

As we first reported, Joslyn James will release more than 100 text messages she claims Tiger sent her while they allegedly carried on ... the texts are pretty shocking.

And James will post other things, such as room keys from Las Vegas hotels with a Tiger image on them.

The stuff will be posted on sextingjoslynjames.com at 11:00 AM ET.