Arther and Rita used condom back then...
Re-read again and you'll findout
YES! When I first read it, I didn't really quite understand what was what he had put there and what was its importance since it seemed there was an intentional focus on it. But after reading about the baby and stuff and, like everyone else first thought was on Arther, it hit me THAT's what that was and that's why there was such an importance to making sure one saw it.
Naah can't be cause Arthur used condom here: http://www.mangago.zone/read-manga/j_no_subete/tr/145996/page/158/
And when J had sex with her it was clearly shown he came inside her.. Well the author really gave us all the details to avoid misunderstandings
Just wondering.. couldn't Jean have been Arthur's kid? If I haven't got it wrong Rita did have sex with him the previous night and the next day with J ........ doesn't really matter but it was bothering me ( ̄∇ ̄")