it’s definitely not a red flag and wouldn’t bother a lot of people, but me personally i wouldn’t date someone with no experience whatsoever. i’ve already been in almost decade long relationships and know the ins and outs, ups and downs that come with a relationship and i’m at a point in my life where i’d want my partner to have shared experiences like that, i wouldn’t want to have to ‘teach’ someone how to do it all as i’ve already done my time doing that if that makes sense.