TWOS is a general rule, but we do have some exceptions. For otoko no ko characters, it’s probably safest to rely on the Pixiv tags to determine this if it looks too ambiguous to tell either way. Given that this artist seems to always draw Bridget as a male with breasts (and I realize this is a contentious tag), it is extremely likely that the R-18 versions show breasts and a penis (I can’t view them because they’re paid rewards).