5.3 sex
Sex in a public place - nobody turns attention to children when they play in a park, and equally not to older children when they play with themselves. Everywhere there's shrubs and fine grass, it is easy to get away from the way; again, even when it is in the visible, and it does happen that they roll away or a shrub gets rolled over, nobody turns attention, one would say they try not to watch. Presence of children is avoided, though, until they learn the custom (to not turn their attention).
They were completely compatible with our customs, though it may not be true in the oposite direction. Same general traits - no violence, no domination games, and a total lack of any paraphernalia. They use only their bodies, nothing else. No other stimuli.
Special traits: they have fun. If you hear laughter from a bush, you don't need more than one take at guessing what caused it. This also means they are very relaxed, no stage fear.
Mating rituals: no fixed rituals. Given their total lack of restaurants and fancy places, it comes down to usual looks, soft talking and a few facial signs, which are pretty much commonplace. Rarely bring confusion about. Refusal is usual, and there are varying degrees, between not now, not today, not you, not your gender, not anyone ever.
Threesomes etc: depending on agreement. There are no special orgies - it's just a different sort of party, or rather a party which may or may not include this sort of pleasure.
Conception: voluntary. They seem to have a way of preventing or allowing fertilization at will, both sides. Though they don't really keep their numbers on record, nor is there any sort of census, the population seems to grow, but very slowly. Or it just grows in some places and goes thin in other? We haven't seen too many new houses, but also haven't seen any ruins or empty ones. Some are turned into warehouses, or keep two people where they could keep six. There's no way we can know if some of these are overcrowded or almost empty - that may be just an opinion of those who live there. And they don't live in the same place all the time. They are quite mobile, changing houses, changing partners, changing countries at will, and mutual agreement.