Unfortunately I don't like the quote myself, namely because it tends to be...
Well I guess the phrase is "slut-shaming". "Promiscuity is bad! It leads to disease!" Well, not exactly. Unprotected sex, even monogamous sex, can lead to disease. Some people are born with STDs because their mother had one. Others can get them from methods other than sex.
On the other hand, being responsible when having sex, even promiscuous sex, can prevent several STDs -- including pregnancy.