If it's ambiguous whether a character is having sex or not, use [[implied sex]].
If a character is having sex and it's obvious that it's anal (such as with a male) but you can't see the penetration, use [[anal]] and [[sex]].
If a character is having sex but you can't tell whether it's anal or vaginal, use [[sex]].


Same logic applies to [[implied fingering]] vs [[fingering]].