A marginal observation: - males in nature have a duty on that topic, distribute genetic material; - female in nature have to select the best genetic material

A marginal observation: - males in nature have a duty on that topic, distribute genetic material; - female in nature have to select the best genetic material they are able to find. "The best" is a complicated definition that in practice tend to be hormonal, that's why female normally want in person meeting and find "catalogues" not much useful. The females who find catalogues useful might just look at having temporary fun "from a list" or find someone rich to escalate their social position. That's essentially why on-line dating will not work much anyway until we found a way to understand "genetic profiles matches" witch is so far sci-fi. The rest is just noise, sometime useful indeed especially if we live in spread areas where potential partners are far from us bu all current "matching techniques" can't simply match the most important natural characteristic, hormones.