Generally, I do agree with your point that intelligence might be attracting as this represents "healthy individuals" and potential survival of family and species - although, I do think "Sapiosexuality" is just a pop-science-term to express a slight shift towards more intelligent people for choosing as a partner.

The sexual aspect of choosing a partner is still determined purely by the genitalia, in my opinion. However - due to society changing, reproduction isn't the most important thing anymore and man and woman looking for someone "interesting" or "deep" or "intelligent" ... someone to share their whole life with ... might be rather common nowadays because the "imminent threat of having to keep the species alive" isn't so prevalent anymore.

On another note:
Please cite your picture-sources and if a commercial use is allowed.