If he isn't wearing a tie he may play with his shirt/jumper collar and or brush non existent dandruff from his shoulders. He may also straighten out and rearrange cufflinks, coat and shirt.
The most assertive sexual display the man can make to a female is the dominant hands in front pockets with the thumbs out. The thumbs are all that are on display and are pointing towards the genital area.
Often the male may stand facing the woman with his hands on his hips emphasising his physical appearance and show his readiness to be with the woman.