Digits = fingers allowed in her vagina. Most MPA's and SP's prefer very clean hands, well trimmed & clean fingernails, and a gentle approach, at least at the start
Often MPA's will assume during their first session with you that you will probably be too rough, so they will say "no fingers inside". Once in a while a very gentle approach, plus verbal assurances, will change their minds, if not in that session, then in the next time you get together.