I'm going to defend Chase a little. It's not that he's exactly stupid... the truth is that many factors contributed to him being immature, naive, and ignorant. As seen in previous chapters, Chase suffered a lot in the dysfunctional family environment he was born into. Among all his alpha brothers, he was the most sensitive and misunderstood. Because of this, his omega father thought it would be good for him to go into acting, where he debuted with a chocolate commercial. Due to this early emancipation, he ended up not having the same education as his other brothers. He doesn't learn to defend himself – which is why he lives surrounded by bodyguards – and he also doesn't learn about certain things – like how omegas get wet. To make matters worse, Chase is inexperienced in love! He was a virgin alpha before getting involved with Josh. He also didn't have any friends (except Keith), so he doesn't realize that Naomi is playing a joke on him with this "advice". Despite all of this, he still suspects that Josh might be an omega, as we saw in this chapter, but he chooses to believe him because he trusts his partner completely.
SPOILERS
I'm going to defend Chase a little. It's not that he's exactly stupid... the truth is that many factors contributed to him being immature, naive, and ignorant. As seen in previous chapters, Chase suffered a lot in the dysfunctional family environment he was born into. Among all his alpha brothers, he was the most sensitive and misunderstood. Because of this, his omega father thought it would be good for him to go into acting, where he debuted with a chocolate commercial. Due to this early emancipation, he ended up not having the same education as his other brothers. He doesn't learn to defend himself – which is why he lives surrounded by bodyguards – and he also doesn't learn about certain things – like how omegas get wet. To make matters worse, Chase is inexperienced in love! He was a virgin alpha before getting involved with Josh. He also didn't have any friends (except Keith), so he doesn't realize that Naomi is playing a joke on him with this "advice". Despite all of this, he still suspects that Josh might be an omega, as we saw in this chapter, but he chooses to believe him because he trusts his partner completely.