OKCupid is a web application, listings are not static and the information is dynamically updated with a feed in a similar format to how Facebook/LinkedIn/Twitter updates their posts. The adult content is near non existent on the site, that is,
You will have to look for it to find it, in the same way one may:
- stumble across a nude Tumblr blog
- stumble across a porn star Twitter profile
- read the casual connections on Craigslist
Not that I am advocating adult content on the site more that I am saying it is fully possible to answer the question while removing the parts that prove to be age restricted to keep it in scope.
Seeing that the user already has a regular profile on https://judaism.stackexchange.com/ I don't see how any spamming could be occurring.
This is just a case of a user having information that at one point, he may have been trying to find, self-answered himself and decided to share with others.