1
Porn that produces masturbation is illicit sex.
Sorry, what "Porn" is?
There are "Non Nude" Performers too, but they make no sexual actions.
2
The homosexual act is illicit sex.
What is "homosexual act "?
Do You consider a Non Nude Solo Male Performer in Interactive Video Chat as " illicit sex"?
Playing Chess or random talking?
Sex between a man and a woman who are not married is illicit sex.
This is about local laws.
Do You consider "Sex" as the material thing with physical contact?
Personal masturbation when no marriage is possible might be acceptable for health purposes.
Do You accept the assistence of volonteer to someone, who have no possibility to perform the masturbation?
Multiple marriage partners might be acceptable to re-populate a nation that has all but been wiped out.
Who is this Mister?
And this?
Other than a few "need" related sex act conditions (this doesn't include homosexuality),
illicit sex is sex outside of marriage between one man and one woman.
This is again about local law.