A jerk-off template can be a film or a picture that stimulates the viewer so that he masturbates while watching it... And comes.
This term leaves few questions unanswered: a wank template is an image, text, film or similar that is used to stimulate one's imagination in the process of wanking. Wank to stimulate it even further.
The principle: the respective jerk-off template is looked at and the viewer begins to satisfy himself. Due to the fact that everyone has their own personal tastes and preferences, there is no classic jerk-off template. Rather, many media have the potential to become jerk-off templates.
Porn and magazines with erotic content are particularly popular jerk-off templates. Especially in connection with films, the importance of acoustic signals should not be underestimated. Many gays are not only turned on by watching the respective template, but they also love to listen to it.
Those who find a jerk-off template on their partner are sometimes shocked. Unfortunately, many gays (and straights) still see using a jerk-off template as a special kind of cheating. In most cases, it is merely a special form of fantasy stimulation and is therefore in no way meant to be malicious or derogatory towards the partner.
However, calling a model or a porn actor a "jerk-off model" is often a form of disrespect. This is why the term is sometimes used as a swear word for people who - for example in social media - show themselves in a particularly revealing way in order to generate new followers.