Definition (技能)
Describes someone's level of sexual skill, either positively or negatively.
性技佳（或不佳）
Despite his other shortcomings, she admitted he was great in the sack.
尽管他有其他缺点，但她承认他在床上很棒。
They broke up because she found him terrible in the sack, even though he was otherwise a good partner.
他们分手了，因为她发现他在床上很差劲，尽管他其他方面是个好伴侣。
She said that while he wasn't the best she'd ever dated, he was certainly good in the sack.
她说虽然他不是她约会过最好的，但他在床上确实不错。