點解會有???一全十......十全百???

有好多性病的源頭是來自大自然的細菌或動物
例如愛滋病來自熱帶雨林的黑猩猩
因為當地土人有生喝猩猩血的習俗
結果傳比土著，再慢慢由性行為傳開去

性病姐係好像"SARS"似傳染的方式來傳別人
咁你又話性病係同有性病的人性交傳染當係又唔同講法la
咁人身體上都有抗體la
但你而家係醫學上都係"不治之症"

1) 可能係天生,父母其中一個有 即係唯傳病

2) 一個有性病既人同本身冇性病既人進行性行為

It is seems like 'chicken vs egg' who come first.

By the way, it is not a question anymore, as someone already have '性病'.

However, new born baby may also have 性病 if the mother have it. eg AIDS, etc