In the latter 1990's to somewhere in the early 2000's, Jeffers used to do a lot of nude modeling under the name of Carl Hardwick for the large gay male porn company, Colt Studios. Tom Prince did a little modeling for Colt too.
I have known a number of straight guys who did gay modeling, both nude and clothed. It was easy money, which they badly needed. But also their self-esteem was healthy enough to withstand any "homo" criticism. And too they recognized they very physically attractive and shrewd enough to capitalize on it.
Let me also add I happened to see Jeffers compete in a local LA bodybuilding contest one time. He won, deservedly, he was easily the best built guy in the contest.