When talking to a girl, it is very important to establish a common theme, an interest both of you share. For example

:comfycamera: excuse me, miss. I bought this new camera and would like to test it. Would you mind if I take your portrait?
:akko_blush: not at all!

In this particular case, photography is the common subject which both men and women love to engage in. However, not every activity can be shared like this.

:blobdoctor: excuse me, miss. I bought this new colonoscopy camera and would like to test it. Would you mind if I take your image?
:akko_aaa: POLICE! HELP!

Despite both example sharing a theme of taking a girl's picture, proctology is a male dominated area and many women find it foreign.