lubed

To increase comfort with penetration, your boyfriend can start off with one lubed finger, inserting it gently and slowly.

为了增进插入的快感，你的男友可以先在一只手指上涂润滑油，温柔而缓慢的插入。

This 'O' Ring has to be removed, cleaned and then re-lubed before using the housing.

这个O型圈在重新使用前必须取出来被重新清洁和润滑。