Most blogs that approve of the guest posts let their contributors to leave at least a single link to their very own website. As a matter of fact, most of them don’t offer any kind of money for your hard work. Just a mere brief brand mention or a keyword optimized link is the least that is done to act as a reward for your hard work.
Nonetheless, even a single backlink from a top notch blog will immensely benefit your SEO process. It tends to make your content more discoverable and easily indexed to the search engines such as Google. Try to target websites in your dating guest posting or other niches as much as you can in order to establish relevancy.