Woman here, but Ive gotten compliments on my compliments giving skills haha so just trying to help.. I try to go for specific, unique, playful compliments.. you can give compliments when you observe what you like about them right then and there, but also throughout the day through texts when you are away from each other.. examples:
Your nose kind of crinkle when you smile and it is so adorable, I just want to kiss you when I see you smile like that.
Your butt looks really good in that pants! (Bonus points if you remember which pants he wore so you can compliment the next time he wears that pants by saying "aww babe you wore my favorite pants!!" "I love when you wear that pants!" This tells him you are sincere about your compliment and Voila! Now his confidence boosts up everytime he wears that pants!)
You are so thoughtful! I am so lucky to have you :) What did I do to deserve you?
Calling them by petnames like: Hey Gorgeous! Stud! Sexy! Cutie! Beautiful! Handsome! Etc..
-butt grabs!
-You are the perfect balance of sexy, cute, smart, handsome, thoughtful and caring!
-Also, compliment on his capabilities/knowledge, not just physical things.. I think a lot of men feel sexy when they are doing something well, especially the stereotypical manly stuff.. for example, "Wow babe! Thats amazing that you know around cars! Where did you learn how to change the oil?"
Also, do you dirty talk during sex? If not, dirty talking tends to boost up peoples confidence by a ton! (I know it does for women as well!) Examples:
Oh babe, I love how your big cock fills my mouth. I love when your cock throbs in my mouth.
It makes me quiver when you slowly slide inside me.
Babe, the face you make when you fuck me drives me wild. You have those fuck me eyes..
Ive fantasized about fucking you all day long.