i think with most people its the first or second time you 'go out' properly as in dating. people on here saying stuff like 'one year' and 'five months' probably mean they knew the pwerson as friends first during that time and only kissed them once it moved on from just being friends.
for me, first bf - seecond date, tho we'd known each other for a while, second - second date or maybe the third and we'd known each ther for awhile iheard it is the first time you go out with someone you are already mates with, or otherwise the second if you barely know them tho it can be the first.
for me it means i am serious about the guy. for many, they kiss their mates on drunken nuights out and it means less.
deopends on the gitrl, but i think its cute of you to ask this