Yes I know the statistics are very much against contracting HIV that way. I recall what my activities were during the window when I became pos. I was fucked a handful of times also then by guys using condoms - so that could also be the transmission route, i. e. broken condom.
Guess what I a trying to say is there is no 100% guarantee practicing "safer sex" will work 100% of the time.
I am alos definitely not saying you should stop your sexual life by living in fear. For example just about any doctor will mention the risk of contracting another strain of hiv. But I do not let that possibility interfere with my sexual practices. You just have to accept that there is no 100 % guarantee on this stuff.