We have to look at this logically im pretty sure the most prominant people who would have a sluggish liver would be alcoholics. Ive known many and all they ever smelt of was stale booze or nothing whe sober and clean.
I know what your saying ie it would be more of an issue if it was something to do with penetration in for example the gay community. On the last few years i have certainly seen more than a few posts from gay people who claimed to have the smell.
One thing im pretty sure of myself is that mine is down to my sphincter not closing properly because of my hemmorhoid. In the last few weeks i have been able to get my hemmorhoid down to nothing and my sphincter has been completely closed and i havent had anyone sniff or hold their nose or anthing which is quite an example considering it was an almost daily occurance. Its started to get a touch sorer and a bit bigger again and i feel the same old feeling of the back door being open so to speak. I have an appointment with a surgeon in the next few weeks about having it removed so i will see if that comes to fruition and if not theres still lots of things i can try to get rid of it naturally so im hoping that this is the way to go.
Also reguarding your point in sperm making peoples vaginas or anus stink well thats the chicken and the egg scenario, it could be the person but it could be the sperm that has a horrible smell to it aswell its a hard one.
Anyways best of luck and hopefully you will find yourself a cure soon, its a horrible and demorilising condition to have, all the best.