Steve was born in a time where the thought of sucking another mans cock or having him cum over your ass cheeks was seen as a severe character flaw and something that only girly men indulged in. Now as i am sure you all know, Steve did not possess any character flaws and was pretty much the most masculine man that ever lived. Therefore it's safe to assume that there is an inherent design mechanism of the universe that renders it impossible for Steve Reeves to partake in homosexual behavior.
It was also impossible that Steve or any other ironager could have used steroids, Steve's genetics were so good and his work ethic so pronounced that he would have seen it as a rebellion against god to take such a short cut.
Posing in your underpants all oiled up in front of a room full of men was seen as extremely manly behavior in the 50's but due to a conspiracy involving the vatican, Kate middleton's breasts and our very own reptilian hybrid known as Sev, attitudes changed, try not to apply modern day values to Steve's exhibitionism, it was seen as extremely heterosexual back in the old days.