I'm no having a pop at you many people and indeed cultures see menstruation as "dirty", personally i just don't, its just a normal and natural cycle which doesn't cause me any kind of repulsion.
There are good reasons why I would be repulsed by someone else's shit for example and its been tested that we have a hardwired reaction to avoid it as it could carry disease that we do not have and is a toxic waste product of the human body.
I asked about the blood thing in case you had a general aversion to blood which many people do, I'm not overly keen on looking at open wounds etc. and having been present at 2 cesarean sections I've seen my far share of someone else's blood and was far from keen so can sympathise.
I'm genuinely interested in why many men find the whole menstruation thing "dirty" or repulsive simply because I don't, others may judge that view as being wrong or immature or whatever but for me it was a genuine question, I appreciate you initial response was nothing more than a flippant remark and that the pics were likely to provoke reaction, but you have continued to refer to the subject as "dirty".
It's not a biggy for me I'm not looking for you to justify what is the view of many people but i do think your wrong.
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I had sunbed, well actually cabinet treatment on the NHS it was UVB and I I got really brown from it, just as it started helping my skin condition they said they could give me any more as I'd reached the recommended limit, normal sunbeds don't use the right sort of tubes using more UVA so I have never bothered with them, I did look at getting one for home and buying the special Phillips UVB tubes at one point but it was way to much cash.
I'm quite happy with my usual pasty look I'd never use a sunbed just to get a tan, but each to ther own.