I've never understood the strategy of sending ladies and/or couples a dick pick as a conversation starter.
What immediately comes to mind is that every guy has one, so right off the bat you're not differentiating yourself from others on that front. Also, unless you have outlier-type length or girth, you are not going to set yourself apart from the others either - unless you are on the small side, and that you don't want to advertise anyway.
Come to think of it, having a super large or thick tool may set you apart, but it may just count against you as the larger members can be uncomfortable and even painful for the ladies - and the husband may feel he's not willing to have the comparison made….
Furthermore, the visuals just aren't what gets the ladies going (not like us guys, show us a pair of titties and we're switched on immediately). Wit, charm, manners, conversation, those things need to land first, then she'd be happy to see the goods (and she'll let you know).
Frankly, if you're expecting her to get wet and horny from seeing a pic of your probably-average dick, you're really expecting a typically-male sexual response, and that, I'm sure many would agree, sounds just a little bit... gay?….
