According to the search results, there are several terms used to refer to the male equivalent of a cougar, which is a term used to describe an older woman who seeks sexual relationships with younger men. Here are the terms that are commonly used:

• Rhino: According to The Urban Dictionary, the male version of a cougar is a "rhino". However, this term is not widely used.

• Manther: This term is also used to describe a man who is older and seeks sexual relationships with younger women. According to a post on Reddit, a "man-ther" is a man who is between his 30s and 40s and gets much younger women. This term seems to be the most commonly used term for the male equivalent of a cougar.

• Dingo: This term was suggested by a reader in an article on YourTango. However, it is not widely used.

In conclusion, the most commonly used term for the male equivalent of a cougar is "manther".