Sanji always brags. That's all he knows to do since a young age, from his luxurious vacations to his family's money to downright horny bullshit like his hUgE dick size and the women he bangs. Bro really doesn't know when to shut his mouth, does he?
But under all that sass and confidence, he was a total loser, the farthest he had gone was ALMOST getting head but then he chickened out. Even with all his money and friends he was a smol lil sweetheart and you saw right through his microexpressions and language. He'd rather pet a stray cat than go on a yacht filled with bitchy bimbos but he has an image to maintain or so he thought. "Hey baby, my boner says hi." Of course he knew his lines were godamn cringe.
He always hit on you, trying to get you to be one of his babe collection. But you knew what hid deep within Sanji's smirks and perverted comments.