Maybe try explaining the concept. If you leave people to find out by themselves they may take longer or wind up with some strange conclusions.
Anyway the finale, climax if you will, of the male sex act is the ejaculation of some sperm. Though the precise nature of it is still the subject of some discussion among the relevant medics it seems some women can also ejaculate some fluid following sexual stimulation, in some cases high volumes with a lot of pressure but you can discover porn bloopers on your own time. While a fairly rare ability it is never the less one that many find alluring, such that it is a common tag or category on porn sites*. The colloquial/slang name given to the phenomenon is squirting and is utilised as a verb as well.
In this case the image is designed to bring to mind word association games -- for instance if I hear the term resistance then as someone what plays with electronics on a routine basis I will think the component of impedance, should you be speaking to a historian that commonly deals with world war 2 they will likely think of another concept. As the internet is said to be for porn the reader is supposed to imagine that the image maker has spent too much time on the internet. Furthermore it may also cause the reader to pause for a moment of self reflection if they also immediately considered it as such. Both of those are common elements in humour.
*the folks at one of the more popular sites to purvey pornographic materials also collect statistics on the matter. They claim it is one of their top 20 categories and the site itself has an 81 million per day visit rate then yeah. Despite the link itself not containing any content that might trouble me here I opt not to do so.