yes...it's normal

Yeah you're fine. Throbbing is fine.

Yes, that is very normal.

Yes, it can. I think you will find it matches your heart rhythm. When hard, the way out for blood from the penis is restricted but the way in is not, so as the heart beats it causes the pressure inside the penis to peak as well. As you get closer to cumming your heart rate and blood pressure both increase which is likely to make this effect more noticeable.

When I'm horny mine throbs, not when its just a spontaneous erection

Perfectly normal.

Normal for sure. I think that I can check my heart rate using the throbs

Happens all the time, particularly if I'm excited. Like Chris said, if I'm super excited, I can feel my pulse in my penis!

Oh yea, my penis pulses and throbs when I'm about to orgasm.

Ditto!

yeah its normal happens to everyone

Sounds pretty normal to me. When I am fully hard, I can feel mine throbbing and if I am standing up then I can see it moving/throbbing up and down slightly with my heartbeat, and feels heavy

Mine throbs a lot when I’m hard too. Feel like it leaks every time it throbs lmao.

So long as it’s not like painful and abnormally throbbing
But when you’re hard it’s full of blood and it’s your pulse making it throb

^I think that's quite normal for that level of arousal. Kyle is right that it's a result of your pulse, even if it is more noticeable when you're at the peak of um...horniness.

It's kinda funny that "throbbing" has turned into some kind of erotic descriptor that you might find in the likes of Fifty Shades of Grey (I guess like "heaving" if it's followed by the word "bosom").

I think it’s normal for your penis to be throbbing. That happens to me all the time, whether I am spending time by myself or with my girlfriend.