one thing to remember here.... Twitter for pornstars is not a "real look at their real lives", it's "looking at what they let you see"
loads of pornstars refuse to discuss their personal lives, Katie K is a good example - she's engaged in real life, yet makes out that she's single on her Twitter because it keeps her fans interested in "believing" that the character she's portraying is genuinely a single bi-sexual girl (that way, people think they're still in with a chance)
loads of pornstars will use Twitter to extend their persona, but they don't use their "work" Twitter account to convey their real life, it's only interacting with their fans just like they would at conventions etc.
a wedding/engagement ring can be taken off for a scene or public appearance, but the marriage is still real behind the scenes where they don't want you going - this is WORK for them, this is not real life, Sandy doesn't get up in the morning and go hunting for a girl to lick out because "Sandy" isn't real, Zsanett gets up and goes to work as a model, but she comes home to her husband and has a "real life" away from cameras
sorry if this ruins the image for anyone, but its just reality