No, there's neither yaoi nor yuri in this manga, although some of the friendships in the manga, for example between Ango and Ryou, are treading quite close to the line. But all male-male and female-female relationships are definitely generally friendship-centered only.

After all, the people who created the 7 Seeds project wanted the Seeders to leave behind descendants and re-populate Japan; there's no way they'd have allowed homosexuals into the program. In many senses, they were quite prejudiced; disabled people and the like also weren't allowed in. The Seeders were supposed to be the perfect Japanese, Team Summer B being the only exception.

I hope this answered your question.  Will you still give 7 Seeds a try despite that, though? It's really an amazing manga worth reading, with or without yuri.  ;-)

Lg, Ysaye

Thanks for the quick reply, I'll give the series a second attempt it's intresting so far, just missing something extra.

Shame about there being no yaoi or yuri, but it makes perfect sense considering the scope of the 7 seed project like you said. 

Also, well done on maintaining a wiki like this, world needs more fans like you.

Have a good life !

Thanks! :-D