Green’s Dictionary of Slang

dirt track n.

the anus; thus dirt/mud track rider/specialist, a sodomite.

1967
1970198019902000
2001
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[US]N. Mailer Why Are We in Vietnam? (1970) 16: I hope at least Ranald has got the taste and sentiment to be putting it in the young lady’s vagina rather than going up her dirt-track.
[Aus]G. Seal Lingo 115: Related usages are to ride the tan track; dirt-track rider; ride the chocolate canyon, and to drill for vegemite.
[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 56/2: dirt track rider (also mud track rider) n. a homosexual. go dirt track riding to engage in homosexual activity.

In phrases

if the river runs red, hit the dirt track [SE road/road n. (1b)]

when a woman is menstruating, opt for anal intercourse.

2002
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Duncan-the-disc-jock posting on ‘DJ Schwede’ at DI.fm 🌐 I don’t rate highly – too commercial and has been played out many many months ago. If the river turns red, hit the dirt track instead!