I read this on Kuaimanhua, they don't have smut. Most Chinese BL on apps or want to publish books and earn money later, don't have sex scenes or even kiss. Cause the gov doesn't want it on. Therefore, if you want smut scenes like these, usually the authors will upload them on their Weibo or Twitter. It's totally up to the author if they want to release smut scenes on a different platform, but in their main, official sites, those are no no.
Even BL novels nowaday are also censored. Especially big/ famous novels on big website like http://www.jjwxc
I don't get Chinese webtoons. Like in this one there is actually smut and then there are some where they even censor the kiss. For example in Here U are manga they actually censored the nipples with pink flower emojis like wuuut! #-.-)