There's a chart.
Kiss Chart
Full kisses:
6.7 - Michiru x Airi
14.7 - Mahimahi
60.5 - Ayano x Miyoshi
85.7 - Shizuka x Mio, 85.9 too
97.2 - Shizuka x Mio (flashback), 97.5 too
98.8 - Kaoru x Shizuka
100.10 - Ayano x Miyoshi
102.5 - Mahimahi
107.2 - Kaoru x Shizuka (flashback)
107.3 - Shizuka x Mio (flashback), 107.11 (for real)
110.7 - Kaoru x harem (fantasy)
115.12 - Ai x Chie, finally!!
117.10 - Shizuka x Mio
122.6 - Kaoru x Mask, there's a mask in between them, still I'm counting it as a kiss
143.12 - Shizuka x Kaoru, oh no....
149.10 - Ai x Chie, dawww!
156.12 - Kaoru x library girl
186.10 - Mio x Shizuka, through 186.13 Multi-page color kiss!!
189.17 - Kaoru x Mask, another masked kiss
192.14-15 - Ai x Chie, color
198.4 - Mio x Shizuka
204.3.4 - Ai x Chie, color
209.10 - Yuu x Mari
216.10 - Elisha x Honoka, a glancing blow, but Eli says it's so
232.7 - Ai x Chie, 1 page away from color, argh
237.8 - Ai x Chie, 237.9 too
One-sided / near kisses (lip play):
19.6 - Mahimahi
23.6 - Nononon x Yumimi
37.11 - Ai x Chie
39.12 - Elisha x Honoka
45.12 - Elisha x Honoka
46.7 - Kaoru x Hibiki
49.10 - Ai x Chie
68.7 - Kaoru x Shizuka
85.3 - Shizuka x Mio, 85.4 too
92.8 - Yuu x Mari, 92.9, 92.10 too
99.12 - Nao x Nao
100.11 - Ayano x Miyoshi
101.7 - Ai x Chie
131.9 - Yuu x Mari, 131.12 too
138.12 - Mahimahi (?)
139.10 - Yuu x Mari
146.12 - Nononon x Yumimi, 146.14 too
156.9 - Kaoru x library girl, 156.10 too
159.9 - Mahimahi
163.7 - Ayano x Miyoshi
163.15 - Micihiru x Airi
168.5 - Micihiru x Airi, 168.9 too
172.13 - Elisha x Honoka
196.3 - Ai x Chie, color
206.10 - Mahimahi
206.10 - Mahiru x Yuu, 206.11 too
206.12 - Yuu x Mari
206.14 - Mari x Mahiro, trouble
209.13 - Mari x Yuu
214.10 - Yumimi x Nononon, 214.11 too
216.9 - Elisha x Honoka 2x
219.3 - Yumimi x Nononon, 219.5 for the reversal
220.3 - Ayano x Miyoshi, 220.5 for the reversal (virtual?)
224.7 - Elisha x Honoka
233.4 - Mariri x Mayuyu (?)
234.15 - Yuu x Yuu