I don't remember any H-Scenes in the first games, but it's not surprising that the third gets some, given the horny state of today's audience.
I'd rather the series remained in it's fairly innocent state, Da Capo 1+s2 had a very nice story driving it, Da Capo 2+s2 also had a nice story, so I would prefer it stay that way. Complain all you want but Da Capo series are very nice, I stil don't understand the hate it gets on this community.