I agree that people who do not have sex are not at risk from sexual transmission.
I am just surprised you thought it needed saying.

Nobody, I repeat, nobody is calling for any HIV testing on anybody on the basis of being gay.

Yes they are.
PHE, NAT and all the other agencies.

"There is nothing, nothing whatseover to substantiate a campaign focussing on gay men. It is homophobic to do so."

Silly.