Eh, sex/romance/dating is pretty important to the vast majority of people, and it's probably healthier in the long run to treat it as something that you can discuss with your friends (and e-friends, if that's how you roll, e-socially) rather than a sacred taboo. Lord knows "let's not talk about it" has a shaky record at best in helping people cope with the physical and emotional aspects of love. So many stories of fucked up situations that people tolerated involve some variation of the phrase "I didn't realize it wasn't normal."
Adolescent bragging about getting laid is obviously chintzy, as is the humblebrag. But I'm only really bugged by the sense that someone is using another person to get achievement points from their social circle , not that they're breaking some age-old code of chivalry. I mean, a "gentleman" doesn't let his lady vote or own property, so I'm not all that concerned with meeting his standards.
PS Posting pictures of a girl without her knowledge or consent is most definitely a party foul in most or all contexts.