 If you liked
Haiyore! Nyaruko-san
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 ...then you might like
Dakara Boku wa, H ga Dekinai.
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In both Haiyore! Nyaruko-san and Dakara Boku wa, H ga Dekinai, we have a main guy, who's living a peacfully life, untill aliens, demons and other monsters pops out everywhere.
In Haiyore, we have get a harem with 3 alien girls (one is half girl half boy... depending on how you look at it), where 2 of them is fighting to be his love.
In Dakra we get another harem with a main who is one hell of a perv, and somehow get quite a few lovers from that.
Note that Haiyore is not an ecchi, it lacks fan-service, and have no plot. But it's one hell
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