<human>: Condense the text into a few key points

Didn't know which subreddit to choose between relationships or here...

I'm 29, gf 30 dating for 19 months.

I'm not american and am from a very religious culture/family. I'm not religious myself and have changed a lot especially since I moved out of my country. My ex is an american girl, a very passionate environmentalist, who doesn't drive by choice and even doesn't have a license. 

Yesterday we were biking to the grocery store when the topic came up. I told her I'm not comfortable with her biking naked and I don't wanna hang out with such people (I admit I am not open when it comes to sexuality). She said I shouldn't be hanging out with her then because she would do it. I didn't say anything until a few moments later when she asked me why I was still standing next to her (We were in line to check out then). I left immediately and biked back home. Don't get me wrong. I bike as much as I could and am not against bikers' rights. 

My question I guess is if biking naked as a way of protesting is any different than biking with clothes on? I think I'd like to extend my question and ask if it makes any difference in any type of protest if protesters are naked? I know it may convey a meaning, but at the same time, many people may not take it seriously. How many of you would end a relationship for this? We survived so many ups and downs in our relationship and we seemed to be getting along better recently. Also consider in mind that she always claims she's a private person, and honestly, I can't remember when I saw her naked (We had lights off policy).
<bot>: GF dumped me 'cos I didn't feel comfortable with her protesting naked. Is naked protesting more effective than clothed protesting? Would you end a relationship if this disagreement comes up?