A jack off party could be translated as "wank party". At classic jack off parties, sexual intercourse is excluded.
Who has a Jack off party, loves to watch the other guests Wank Watching or being watched while jerking off. At the respective parties, however, fucking is considered a no-go!
Whether they then masturbate alone or together in a group is up to personal taste. Many men also decide to spoil other participants with a hand job in the course of the evening.
Especially with regard to topics such as STDs and Safer Sex the classic jack off party is a comparatively safe option. All it takes is the fun of wanking, a little voyeurism and tissues. The latter are, of course, a standard part of a hilarious jack off party.
If the event is celebrated in relevant clubs - and not at home, for example - there are even often employees who collect the used tissues so that a convincing level of cleanliness can be ensured.
Modern locations not only focus on hygiene, but also on variety. For example, you can jerk off in different rooms and/or watch yourself jerk off on a platform.
Many organisers are meticulous about adhering to the relevant rules. In addition to the fact that sex is not allowed at a typical jack off party, some club operators make it a point to enter the rooms exclusively naked. If you fancy such a spectacle, you should check event calendars and the like beforehand. Many clubs announce their parties weeks in advance.