 If you liked
Oretama
|
 ...then you might like
Adamas no Majo-tachi
|
Both manga have a lot of females trying to squeeze out Mc's b*lls and the protagonist tries to resist them, because of very important reasons.
In Oretama the Mc doesn't want Lucifer to be unsealed and in Adamas, the Mc shoots out precious gems, but for every gem, 1 year of his life span is reduced. Therefore he tries to run away and resist all the female advances.
Out of all the current recommendations here, this one has by far the most similar feeling to Oretama.