Tips please😇

My boyfriend is taking me shopping and has his eye on one specific thing he wants me to buy, it's a swimsuit/body suit and has said that once I have it he wants me to pose whilst he does a little photo shoot of me but he wants me to pose sexy, I have NO IDEA how to be sexy! He tells me I do it every single day but I'm too shy to pose whilst I know someone's taking photos! Could anyone help me with some 'sexy' poses he might like??