Apparently my case was fairly important in getting it changed in Scotland. I was attacked in 2005 and it went to court in 2006. It was officially called sodomy then and tried as a form of indecent assault but all the police and procurator fiscal that I dealt with were up in arms and complained lots about it. A year later there were significant changes in the law in Scotland, which gave men the same recognition as women, along with including sending unwanted sexually explicit texts and e-mails as being a form of sexual assault and it is now the case that the woman (or man) takes drug and alcohol tests when it is reported in a bid to establish whether or not the woman (or man) was deemed to be in a fit state to give consent. Not great, but a lot better than it was.
Also, when I reported, the police didn't go as far as to say it never happened, but one of them did say he'd been in the police for 20 years and has never had to deal with a male victim that wasn't under the age of 12 before (I was 19 at the time). Everyone in the police was incredibly supportive to be fair.