From here:

The free session, called Generation Sex, was being run by Portsmouth City Council with the aim of encouraging older people to practise safer sex.

Organisers said participants would be able to have frank and honest discussions about the realities of sex for the older generation.

But the workshop, set to have been held on Wednesday, has been cancelled.

A council spokeswoman said: “Sorry to disappoint but the sex over-60s event has been cancelled due to lack of interest.”

[….]

The council said proof of age and Portsmouth residency would have been required by those attending.

The reason for this could be: those over 60 are not interested in sex; those over 60 are not interested in safety; those over 60 who don’t already know what safe sex is are no longer with us; or – and this is my bet – sexagenarians who don’t already know what safe sex is can’t produce a proof of age because they don’t know what that is either.