Rashi: After detailing the praise of every limb, the summary is, how beautiful is all of you, and how pleasant is to cling to you, love that is proper to delight in it.

Malbim (Melitzah): How beautiful is love. You are very beautiful and pleasant, but only in delights. I.e. if you love the body, and live temporary life, you will have pleasure of time and all its indulgences. Then the love is good, but not in death. Then you will not find delights.