Women who are sexually experienced are not any less worthwhile or deserving than women who are sexually inexperienced, but sentiments like this enforce the pernicious double standard of stud-versus-slut and reinforce the notion that some women are worthwhile and "pure" (the ones who aren't "easily kissed") while others are "impure" ("easily kissed"), not worthy of respect, and "asking for it."
This is why women who are sexually assaulted and raped are quizzed relentlessly on their dating habits, sexual history, clothing, alcohol use, flirting style, hair style, everything. This is why women who are sexually assaulted and raped are treated as criminals. This is why some women are considered "unrapeable," that no matter what they are doing or what they say it's not rape because they deserve it: they're poor, they're stupid, they're sexually experienced, they're sex workers.
This is why sexual predators are able to walk free and attack other women: because as we all know, some women are simply worth LESS than other women, and it's not REALLY rape, they probably liked it. Because girls WORTH "kissing" are not EASILY "kissed." The rest? Not really worth anything at all, let alone justice or protection.
This is Rape Culture, and we're all soaking in it.