Not needed for an actual session.

However, I have had a provider that I've seen several times contact me all dry with just "Hey!"...maybe even a "How are you?"

After a few times of her doing that I suggested to her that if she's going to text, she may as well sext. Sexting would probably make me wanna come spend time with you more than a text I'd get from a civvy chick. But, the drawback was, even when she tried to sext it just didn't seem natural. It just wasn't in her.