It wasn’t as though it would be a problem. If filming an intimate scene with a woman wasn’t all that sexy, he definitely wouldn’t be turned on by filming with a guy. It would be fine.
Source: Knock His Sock Off, by glymr – 镇魂 | Guardian (TV) RPF [Archive of Our Own]
Locked for AO3 users. Filming an uncensored Guardian leaves Bai Yu in a bit of a predicament… Funny and sexy with a side-dish of feels as we get a peek at Zhu Yilong’s inner life.