To think he might be gay?

[chariotspades]

It's men that DS eyes up whenever we are out together. Typically his age or a bit older, good-looking. Is DS simply vain and eyeing up his competition, or more likely he's gay?

As others have said he's likely looking at labels/clothes/competition etc. I still look at other women either admiring their clothes/beauty/to get inspiration and always have and I'm straight.

To those saying "does it matter"

Eh yes? This is his mother, it's natural for her to care and be curious, cautious, concerned, want to be sensitive.

So OP it's normal to question and be curious.

He really could be looking at anything. I probably look at women more because I’m interested in makeup and clothing and I’m trying to figure out what they’re wearing and where it’s from. Who cares really at the end of the day. Nothing to do with sexuality imo, and you might want to consider why he doesn’t share much with you (that itself is really normal too, for what it’s worth).

He could be bi

I've never caught DH eyeing men up

How could anyone here possibly answer that!?