性 is a Japanese kanji written with 8 strokes, listed here under the keyword “sex”. It is built from 生 (life) and 忄 (heart). In Remembering the Kanji by James W. Heisig it is frame 1679.
On KumiJi Glyph Explorer, open the parts search and type “life” + “heart”. 性 is among the results, together with every other character containing the same shapes.
Open 性 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.