Is it normal for boyfriends to say that they are a little yellow sometimes?

Well, it's normal. This is a common problem of all men, regardless of ability or not.

Explain two questions:

Number one: He must have feelings for you.

Second: He wants to have further contact with you, which is the so-called sexual suggestion.

At this point, what you have to do is, if you feel that your relationship with him is relatively stable and there is a greater possibility of getting married in the future, then listen to your heart.

If you think the time is not yet ripe, tell him that you are disgusted with talking about this topic and give up his desire to possess you in the short term.