McCarthyism brought about a heaping dose of homophobia, what with labeling homosexuality as a security threat because blaaaaackmaaaiiil and such. While I would like to think that the state of affairs has improved with advancing gay rights, what with the whole not-discriminating-based-on-sexuality thing, old biases do not always die away so quickly, and I would not be surprised if some things are still ass-backwards.
Speaking of which, if you ever get asked about it, would it be considered relevant or no (interrogator bias aside)? Please note that I am talking about acts between consenting grown ass adults here.
To the best of my knowledge, federal pre-employment polygraph interrogations include no questions about homosexuality and haven't for some time.
In my opinion, the proper answer to any such question is "Fuck you."